Unix and Linux Tips

Selasa, 31 Agustus 2010

Unix Tip: CUT FROM STANDARD COMMANDS

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UNIX HOT TIP

Unix Tip 3491 - August 31, 2010

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

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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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Senin, 30 Agustus 2010

Unix Tip: PROTCOLS WITH NETSTAT

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UNIX HOT TIP

Unix Tip 3490 - August 30, 2010

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

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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

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Minggu, 29 Agustus 2010

Unix Tip: SPELL-CHECK WITHIN VI

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3489 - August 29, 2010

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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Sabtu, 28 Agustus 2010

Unix Tip: SECURE BACKUPS OVER NET

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3488 - August 28, 2010

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

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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

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Jumat, 27 Agustus 2010

Unix Tip: FINDING DISKS W/O ROOT

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3487 - August 27, 2010

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

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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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Kamis, 26 Agustus 2010

Unix Tip: GEEK DECODER RING

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3486 - August 26, 2010

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

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