Unix Tip: CUT FROM STANDARD COMMANDS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3491 - August 31, 2013

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CUT FROM STANDARD COMMANDS

To properly cut the output of
unix standard commands; such
as ls, ps; and properly handle
them without all the extra
spaces, use this:

% ls -lt| tr -s " " | cut -f6-10
% ls -lt| tr -s " " | < --do what ever-- >

tr -s " " ==> here tr in
effect removes all the extra
formatting extra spaces
introduced by unix shell,
for display, and translates
in to format easy to work
with.

If we dont use this tr, then
the -c option of cut will be
unreliable because of varying
size field lengths in the
output and also -f option
will be unreliable because of
extra formatting delimiters.

ls -lt | tr -s " "
ps -ef | tr -s " "

gives us proper output to
properly extract data or
columns.

This tip generously supported by: snlmurthy@yahoo.com


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DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: PROTCOLS WITH NETSTAT

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3490 - August 30, 2013

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PROTCOLS WITH NETSTAT

Use the command:

% netstat -an

It will show you what ports
are in use on the local and
foreign machines as well as
the protocol running over that
port for that connection and
IP address information. It
also displays the state of
the socket being used.

Using the above tip user can
identify the port to which he
wants to send data is busy
or free.


This tip generously supported by: athresh_2000@yahoo.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: SPELL-CHECK WITHIN VI

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3489 - August 29, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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SPELL-CHECK WITHIN VI

To spell-check without
leaving a vi session:

:w !spell -b




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DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: SECURE BACKUPS OVER NET

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3488 - August 28, 2013

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SECURE BACKUPS OVER NET

Securely backup a partition
across a network using dd,
gzip and SSH:

1. The partition to be backed
up must be unmounted.

2. The following does the trick:

dd if=/dev/partition_to_be_backed_up | gzip | ssh user_name@backup.server dd of=name_of_backup_file.gz

As an example, the following
backs up an image of a floppy disk:

dd if=/dev/fd0 | gzip | ssh user_name@backup.server dd of=floppy.img.gz

3. To restore a backed-up
partition across a network:
(From the backup server)

dd if=name_of_backup_file.gz | gzip -d | ssh user_name@target.server dd of=/dev/target_partition

To complete our floppy disk example:
dd if=floppy.img.gz | gzip -d | ssh user_name@target.server dd of=/dev/fd0


This tip generously supported by: steve-g@bigfoot.com


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DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: FINDING DISKS W/O ROOT

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3487 - August 27, 2013

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FINDING DISKS W/O ROOT

On a Solaris system, ever want
to know how many disks are attached
but do not have root access?

% ls -al /dev/dsk/*s2 | grep -v c0t6

However you won't know the
size of the disk space?


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: GEEK DECODER RING

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3486 - August 26, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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GEEK DECODER RING

Ever want to sneek some not
quite politically correct
witticism or other thought
past the "non-technical"?
Or maybe you just want to
un[en|de]code bits, hex or
uu text (boring, but more
practical).

Here's some simple perl
code you can use for a
geek/nerd/dweeb "decoder
ring":

ENCODE INTO BITS, HEX, UU:

perl -ne'$b=unpack("b*",$_);@l=$b=~/.{0,56}/g;
print(join("\n",@l))' <<RM
Tron rules!
RM

Just change the "b*" to "h*"
for hexidecimal or "u*" for
uuencoding.

DECODE FROM BITS, HEX, UU:

perl -ne'chomp;$a.=pack"b*",$_;END{print"\n$a\n\n"}'<<RM
00101010010011101111011001110110000001000100111010101110
00110110101001101100111010000100
RM

I include my favorite
messages that I otherwise
might not write out in clear
text in my signature file along
with the decoder code. It's
enough to scare away most. But,
I've found those technically
superior types get more of a
kick out of "decoding" (cut
and paste to UNIX/LINUX
command line) the message
during their more productive
moments. ;-)


This tip generously supported by: rmuhle@tuxzone.net


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: ARCHIVE ONLY FILES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3485 - August 25, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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ARCHIVE ONLY FILES

The following will archive
only the regular files in
a directory, ommitting
subdirectories and hidden
files:

ls -al | awk '$0!~/^d/ {print $9}' | xargs tar cvf archive_name.tar


This tip generously supported by: steve-g@bigfoot.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: FIND AND EDIT STRINGS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3484 - August 24, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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FIND AND EDIT STRINGS

Ever found a need to find
for a particular string
across the file system and
edit all those files which
contains that particular
string??

Here is a simple way.

Suppose you want to search
for a pattern "mphasis" across
file system and edit those
files..

Just type this at the
command prompt:

vi `find . -name "*" -exec grep -l mphasis {} \; -print`


This tip is supported by: Manjunath.Alkod@mphasis.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: GRABBING THE HIDDEN

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3483 - August 23, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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GRABBING THE HIDDEN

To easily select all
hidden files, use the
following:

.[^.]* ..?*

For example,
echo .[^.]* ..?*

will output a list of
all hidden files in your
current directory.

.[^.]* selects all files
starting with a dot but NOT
having a dot as their
second character.

..?* selects all files
starting with two dots and
having at least one additional
character

Together, they will retrieve
ANY file starting with '.'
except '.' and '..' (even
tricky ones like '...hideme')

The ^ (caret) symbol can be
used as the first character
inside [ ] at any time to say
"not one of the following"
rather than the usual "any one
of the following."

[^0-9a-fA-F] will match any
character that is NOT a hex
digit.


This tip generously supported by: wurzel@concentric.net




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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: VI INDENTATION

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3482 - August 22, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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VI INDENTATION

Indent your lines or remove
the indentation in the vi
editor.

<< Shifts the current line to the left by one shift width.
>> Shifts the current line to the right by one shift width.

You can set the shift width
by command

:set sw

For example, the command to
set the shift width to 4
characters is

:set sw=4.

This tip generously supported by: neetas@noida.hcltech.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: TAR IS A ZIP

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3481 - August 21, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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TAR IS A ZIP

Ever want to tar and compress
a file all in one command:

tar cf - /home/foo | compress > foo.tar.Z

gzip can be used the same way
tar cf - /home/foo | gzip > foo.tar.Z

If you wanted to capture the
output so you had an index file
of what the tar file contains:

For sh, ksh use:
tar cvf - /home/foo 2>foo.idx | compress > foo.tar.Z

For csh use:
(tar cvf - /home/foo | compress > /foo.tar.Z) >&foo.idx

and an index file will be created.


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: LINKS THAT POINT TO NOTHING

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3480 - August 20, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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LINKS THAT POINT TO NOTHING

find / -type l -print |perl -nle '-e || print';

This will look for all links
that are dead and print it
out. It can be piped to a file
and unlink it later. It is wise
to list the links first and save
the output to a file. This is in
case if the links are needed by
users which remove those files
temporary for testing or
housekeeping.


This tip generously supported by: tyl@computer.org


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: RECURSIVE CASE CHANGE

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3479 - August 19, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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RECURSIVE CASE CHANGE

To convert the file names from
upper case to lower in all
subdirectories a simple script
can be used:

for i in $*
do
mv $i `echo $i | tr A-Z a-z`
done


This tip generously supported by: ksatish@in.ibm.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: RENAMING UNPRINTABLE DIRECTORIES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3478 - August 18, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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RENAMING UNPRINTABLE DIRECTORIES

This happened just the other day,
and wanted to make it available.

We discovered a directory with
no name or unprintable characters:

foohost# ls -ail
208978 drwxr-xr-x 1 2430 Aug 3 13:08
209299 drwxr-xr-x 24 3287 Oct 25 1993 .
208946 drwxr-xr-x 49 447 Jun 22 1993 ..

Using the '-i' option in ls
provided the inode of the directory.
We then were able to move the
directory to another name so we
could see what was in it using
a find command:

foohost# find . -inum 208946 -exec mv {} new.dir \;

Worked like a charm.


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: YET ANOTHER COUNTDOWN

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3477 - August 17, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


YET ANOTHER COUNTDOWN

The unix time() value will rollover
to 10 digits for the first time in
modern computer history starting
Saturday Sept 8th,2001. The
timestamp will be 10 digits long,
and not 9.

Here's a short Perl script to
compute the time left:

#!/usr/bin/perl -w
use strict;

my $now=time();
my $target='1000000000';
my
($sec,$min,$hrs,$dom,$mon,$year,$wday,$yday,$isdst)=localtime($target
- $now);
my $now_string=localtime(time());
my $target_string=localtime($target);
my $message=qq{today is $now_string\n$mon months $dom days $hrs
hours $min minutes $sec seconds left till U1e9
($target_string)\n};
print $message;



This tip generously supported by: scooper@absolutemadness.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: KILL IDLE USERS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3476 - August 16, 2013

http://www.ugu.com/sui/ugu/show?tip.today

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KILL IDLE USERS

Here is a quick script to
kill idle users at the 10
hour mark.

Cchange the 10 to the hour
you would like to kill at
and #run as cron every hour
This is for HP UNIX, check
the fields on the "who"
command for your flavor

------- cut here ----------

who -u | cut -c 1-10,39-50 | grep 10: > current
for each IDLE_USR ( `cat current | awk '{print $3}'` )
kill -9 $IDLE_USR
end
exit (0)

------- cut here ----------


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: FINDING CONTROL CHARACTERS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3475 - August 15, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


FINDING CONTROL CHARACTERS

To find out the control
characters in a file, we
can use following two methods:

% cat -vet filename

or edit the file using vi:

:set list

This tip generously supported by: tb.unnikrishnan@citicorp.com


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NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: VI AND NOT DISK SPACE

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3474 - August 14, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


VI AND NOT DISK SPACE


If you get the error while
opening a file in vi,

"There is not enough space in the file system.
[Press return to continue]"

and you know that you have
space in your home directory,
than simply use this command
in vi, say

:set dir=</export/home/foobar>

then press:

:e .

You will be able to see the
entire file.


This tip generously supported by: kramakri@visa.com


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DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: CHANGE TO LAST DIRECTORY

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3473 - August 13, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


CHANGE TO LAST DIRECTORY

Return to the previous directory:

To return to the last directory we
were working in type.

cd ~-

This tip generously supported by: Prashant.Mhatre@nasd.com


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DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: COUNTING BLANK LINES

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3472 - August 12, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


COUNTING BLANK LINES

Counting blank lines in
a file which may include
spaces and tabs:

cat filename |awk ' /^['\ '|'\\t']*$/ { ++x } END { print "No. of Blank Lines = " x } '


This tip generously supported by: rajibroy@engineer.com



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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: GETTING MORE FROM SIGSEGV

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3471 - August 11, 2013

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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


GETTING MORE FROM SIGSEGV

For those who want to get
more info on SIGSEGV for
your application in Linux,
you can use the following
command "catchsegv".

for eg: consider the program (a.c)
main()
{
char *p = 0;
*p = 'a';
}

$cc a.c
$catchsegv a.out #produces the following output


*** Segmentation fault
Register dump:
EAX: 00000000 EBX: 4010e1ec ECX: 08048398 EDX: 4010f098
ESI: 4000ae60 EDI: bffffafc EBP: bffffab0 ESP: bffffaac

EIP: 080483a8 EFLAGS: 00010296

CS: 0023 DS: 002b ES: 002b FS: 0000 GS: 0000 SS: 002b

Trap: 0000000e Error: 00000006 OldMask: 00000000
ESP/signal: bffffaac CR2: 00000000

FPUCW: ffff037f FPUSW: ffff0000 TAG: ffffffff
IPOFF: 00000000 CSSEL: 0000 DATAOFF: 0000ffff DATASEL:
0000

ST(0) 0000 0000000000000000 ST(1) 0000 cf118de5ab2a5800
ST(2) 0000 feb02a6c405d9ad4 ST(3) 0000 0000000000000000
ST(4) 0000 8000000000000000 ST(5) 0000 8000000000000000
ST(6) 0000 0000000000000000 ST(7) 0000 847fffdee0000848

Backtrace:
/usr/src/bs/BUILD/glibc-2.1.3/csu/init.c:0(??)[0x80483a8]
/lib/libc.so.6(__libc_start_main+0xff)[0x400369cb]
??:0(_start)[0x8048311]
"csv" 25L, 860C




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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: ANOTHER UPPER TO LOWER

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3470 - August 10, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


ANOTHER UPPER TO LOWER

Changing file Names From
UPPER TO LOWER case and
vice versa

This script can be used
to convert the file names
from upper case to lower
case and vice versa.

####################
typeset -u Lcase
for Ucase in `ls`
do
Lcase=$Ucase
mv $Ucase $Lcase
done
######################

And to convert from lower
case to upper case, just
change (typeset -u ) to
be ( typeset -l ).


This tip generously supported by: yousif_morckos@yahoo.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: APPENDING TEXT AT BOTH ENDS

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3469 - August 9, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


APPENDING TEXT AT BOTH ENDS

If you need to append some
text to both the ends of a
string in vi, use the
following command in vi:

:/^\(.*\)/s//starttextcomeshere \1 endtextcomeshere/

If "iamworthless" is the text
at the position of the cursor
in the vi editor, the output
of the command:

:/^\(.*\)/s//DONTFEEL \1 ANYTIME/


DONTFEEL iamworthless ANYTIME

As you guessed, "DONTFEEL " and
" ANYTIME" are the strings you
would like to crush
"iamworthless" with. The "\1" is
the variable that stores the
entire pattern searched by
the "/\(.*\)/"



This tip generously supported by: hg_krishnan@yahoo.com



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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: CONVERTING UNIX MAN PAGES

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3468 - August 8, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


CONVERTING UNIX MAN PAGES

(Another approach)

To convert Unix Man pages
to text format, you can make
use of one feature of 'man'
itself.

(Check out man man)

Set environment variable PAGER
to 'cat'. Then run

% man command_name > command_name.txt

eg. in csh, to see man ls in
a text file

% setenv PAGER cat
% man ls > ls.txt

NOTE: Do not forget to unsetenv
PAGER, else you will have to
pipe every man command to
'more' or (my favourite) 'less'.


This tip generously supported by: amar_san@yahoo.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: REMOVING FILES WITH BAD FILE NAMES

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3467 - August 7, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


REMOVING FILES WITH BAD FILE NAMES

If a file has a special
character, Unix will try to
interpret the character.
Renaming these type of files
cannot be done with a simple
"mv".....it will have to be
done using the file's inode.

For example:
# ls -i "GSO (website)"
(the "-i" flag will display the file's inode)
41734 GSO(website)

...the inode for the "bad" file is "41734"

1. once the inode is identified, use the find command to
rename the file:

find . -inum 41734 -exec mv \{\} NewName \;

2. do an "ls" to verify


This tip generously supported by: arimaldo@earthlink.net


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: CSH PROMPT SETTING

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3466 - August 6, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


CSH PROMPT SETTING

In (t)csh, here is a better way to
set your prompt to always let you
know where on the system you are.
In your .cshrc file, add
or set the following line:

set prompt = "%m%/% "

This way, whenever you press return,
or a job finishes, the prompt will
always tell you where you are,
without having to change directories
first. Of extra usefulness, the '%m%'
token expands to the machine name.
If you work on a multimachine system,
knowing which machine you're on is
usually of more immediate importance
than where on the machine you are.



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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: CONVERT TEXT2HTML

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3465 - August 5, 2013

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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


CONVERT TEXT2HTML

Ever felt the need to convert a
text file to html?

Create a file named txt2html
with the following contents

# Always start the output with
#an html header

BEGIN {print "<html>"
print "<head>"

# use the name of the inputfile
# as title

print "<title>" FILENAME "</title>"
print "</head>"

# The text is formatted
# already, so use <pre>

print "<body><pre>"}

# lines consisting of a number
# of dashes (more than 1) are
# replaced by a <hr>

/^---*$/ {print "<hr align=\"left\" width=" length "0 size=1>"; next}

# lines consisting of a number of equalsigns are replaced
# by a thick <hr>

/^===*$/ {print "<hr align=\"left\" width=" length "0 size=3>"; next}

# less than and greater than
# sign must me replaced by tags.

{gsub("<","\&lt;")
gsub(">","\&gt;")

# Replace form feeds by a
# couple of empty lines

gsub("^L","<br>\&nbsp;<br>\&nbsp;<br>\&nbsp;<br>")
print}

# At the end of the output,
# we must add some closing tags.

END {print "</pre></body>"}

Make this executable
(chmod a+x txt2html) and you're
ready to start converting your test files.

txt2html something.txt > something.html


This tip generously supported by: ugu@couprie.org


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: EFFICIENT COMMANDS

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3464 - August 4, 2013

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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


EFFICIENT COMMANDS

I cringe anytime I see someone code
inefficiently. Here are three of the
most common mistakes, followed by a
better way to do the same thing.

Bad: cat somefile | grep something
Better: grep something somefile
Why: You're running one program (grep) instead of two (cat and grep).

Bad: ps -ef | grep something | grep -v grep
Better: ps -ef | grep [s]omething
Why: You're running two commands (grep) instead of three (ps
and two greps).

Bad: cat /dev/null > somefile
Better: > somefile
Why: You're running a command (cat) with I/O redirection,
instead of just redirection.

Although the bad way will have the
same result, the good way is far
faster. This may seem trivial, but
the benefits will really show when
dealing with large files or loops.

Regards.

This tip generously supported by: sec@nbnet.nb.ca


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: TOO MANY FILES AROUND

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3463 - August 3, 2013

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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


TOO MANY FILES AROUND

In case there are too many
files in a particular
directory. When the
following is executed:

$grep "ABC" *

And it fails saying with

ksh: /usr/bin/find: 0403-027 The parameter list is too long.

what would you do?

Well you can do the following:

$ls |xargs grep "ABC"

-----
Puneet Agarwal
This tip generously supported by: puneeta@delhi.tcs.co.in



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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: EXTRACT RELATIVE FROM ABSOLUTE

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3462 - August 2, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


EXTRACT RELATIVE FROM ABSOLUTE

Ever had a tar archive which
was tarred up with an absolute
path, but you need to untar
it to a relative location?

There is an easy way to do
this using the "pax" command.
Note: Not available on all
flavors.

Firstly, copy the archive to
the relative location in
which you wish to untar it.

Then, execute the following
command:

pax -r -s ',^/,,' -f file.tar

The contents of file.tar will now
be in the $CWD.



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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================

Unix Tip: BELIEVE THE VENDOR?

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3461 - August 1, 2013

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


BELIEVE THE VENDOR?

Don't always feel that you should
believe the vendor.

Patches, vendor recommendations,
and out-sourced hardware support
engineers are some of the leading
causes of breaking a system. There
are times when you know your systems
better then they do.

If something doesn't feel right or
doesn't feel right , don't let them
do it. Ask a lot of questions and let
them know what your experience is.

Cover yourself first, run full
backups, ask them if the have ever
done the task before. Ask them to
confirm the procedure with a back
level support person.

Many times vendors will out-source
the hardware support to third party
companies. When this happens, you
may never get the same person twice,
nor know what experience he has on
your system.

If one of the first things a support
person does is ask where a phone is,
it is almost a guarantee that he will
lack the knowledge he should have and
will need to rely on someone else for
answer. While we all have much work
to do, DON'T LEAVE this type of person
alone with your systems.

Trust no one, it is you job and
reputation on the line.


-Kirk Waingrow

The tip is supported by: kirk@ugu.com


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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================