=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3613 - December 31, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
OPERATING ON MULTIPLE FILES
Have you ever felt the need to perform a
set of operations on multiple files
simultaneously???
Here is a solution for that.
For instance, if it is required to perform
multiple operations like searching a string
(using grep), and executing an awk or perl
script etc, etc. on not just one file but a
set of files, use the following commands at
the unix prompt:
$<: foreach i (<file_list>)
? echo $i
? grep <search_pattern> $i > tmp
? awk -f awk_script tmp >> report
? ....
? ....
? end
$<:
The files list in the brackets can be either
* Specifically mentioned
* A unix variable which contains a list of
file names. For instance, the variable
"p" can be assigned all the files starting
with string "data" as follows:
set p = (data*)
Other examples are:
set g = `grep -l "Startpoint" * `
or
set all = *
(This assigns all file names in the current
directory to the variable "all" )
And its usage with the "foreach" command will
be as follows:
$<: foreach i ($all)
.....
.....
end
This tip generously supported by: lakshmi@virtualipgroup.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
==========================================================================
Kamis, 31 Desember 2015
Rabu, 30 Desember 2015
Unix Tip: CHMOD THE SYSTEM
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3612 - December 30, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
CHMOD THE SYSTEM
Along the lines of:
D O N O T D O T H I S!
Reports from several admins have
been made that dangerous users
who obtain root for the first
time enable full access to the
entire system. They are using
the following command:
# chmod -R 777 /
If you feel you have any
dangerous users, please advice
them of the dangers of executing
such a command.
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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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3612 - December 30, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
CHMOD THE SYSTEM
Along the lines of:
D O N O T D O T H I S!
Reports from several admins have
been made that dangerous users
who obtain root for the first
time enable full access to the
entire system. They are using
the following command:
# chmod -R 777 /
If you feel you have any
dangerous users, please advice
them of the dangers of executing
such a command.
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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
==========================================================================
Selasa, 29 Desember 2015
Unix Tip: EXECUTE SCRIPT FROM NETSCAPE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3611 - December 29, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EXECUTE SCRIPT FROM NETSCAPE
Do you want to execute a shell
script from your netscape
navigator ?
Go to EDIT>PREFERENCE>Applications
Edit or create an application
Choose the suffix (sh, csh)
Put "sh <%s" or "csh<%s" as application handler.
You can use the xtrem -e option
to get a intercacitive window shell into
your navigator.
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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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3611 - December 29, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EXECUTE SCRIPT FROM NETSCAPE
Do you want to execute a shell
script from your netscape
navigator ?
Go to EDIT>PREFERENCE>Applications
Edit or create an application
Choose the suffix (sh, csh)
Put "sh <%s" or "csh<%s" as application handler.
You can use the xtrem -e option
to get a intercacitive window shell into
your navigator.
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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
==========================================================================
Senin, 28 Desember 2015
Unix Tip: TASK ALERTS
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3610 - December 28, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
TASK ALERTS
Have you ever started a long
running task, and after some time
decide you want to be alerted
when it finishes?
Add this to your .bashrc:
function aldo { while ps -ao pid | grep -q " ${1}$"; do sleep 1 ; done;
echo $'\a'; }
Then find the pid of a long
running process(say 253) and
on a different terminal:
501$ aldo 253
Will treat you to a pleasant beep when the task finishes.
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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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3610 - December 28, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
TASK ALERTS
Have you ever started a long
running task, and after some time
decide you want to be alerted
when it finishes?
Add this to your .bashrc:
function aldo { while ps -ao pid | grep -q " ${1}$"; do sleep 1 ; done;
echo $'\a'; }
Then find the pid of a long
running process(say 253) and
on a different terminal:
501$ aldo 253
Will treat you to a pleasant beep when the task finishes.
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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
==========================================================================
Minggu, 27 Desember 2015
Unix Tip: NO WRITES TO PASSWORD FILE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3609 - December 27, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
NO WRITES TO PASSWORD FILE
The normal mistake in a fit of quick
panic often by users is to be looking
at the /etc/passwd file and see that
there is "READ" access to the world
or "644" on the file.
Time and time again when they first
discover having root access they
change the permissions to:
chmod 000 /etc/passwd
D O N O T D O T H I S ! ! !
chmod 644 /etc/passwd
Is just fine!
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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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3609 - December 27, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
NO WRITES TO PASSWORD FILE
The normal mistake in a fit of quick
panic often by users is to be looking
at the /etc/passwd file and see that
there is "READ" access to the world
or "644" on the file.
Time and time again when they first
discover having root access they
change the permissions to:
chmod 000 /etc/passwd
D O N O T D O T H I S ! ! !
chmod 644 /etc/passwd
Is just fine!
--------------------------------------------------------------------------
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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
==========================================================================
Sabtu, 26 Desember 2015
Unix Tip: EAT YOUR PERL PIE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3608 - December 26, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EAT YOUR PERL PIE
Mom always sed, "eat your Perl pie"!
A common task is to substitute
text strings within one or
more files. The sed string
substitution command is often
used to accomplish this, where
sed is passed a file name, the
string substitutions are written
to another file, and then that
file is copied over the first
file to effect the changes
desired in the original.
This approach has some inherent
problems. The command syntax is
lengthy and cumbersome, a
secondary file is created
which involves additional disk
I/O, and when that file is
copied or moved back over the
first one, permissions problems
and file ownership problems can
be created. If your umask
doesn't match the permissions of
the original file, then the
permissions of the final modified
file will be different than those
of the original. Likewise,
default ownerships and group
names are imposed on the temporary
copy, and if one is not careful,
when the temporary copy is written
back to the original file, these
can destroy the original file's
ownership and group information.
A much better way to accomplish
text substitution within a file or
group of files is to use the
"perl pie" approach, as shown here
on file foo:
perl -p -i -e 's/original text string/replacement string' foo
The above command will replace the
first instance of "original text
string" with "replacement string"
in file foo. If you want to
perform this globally within the
file, add the /g global specifier
at the back end, as follows:
perl -p -i -e 's/original text string/replacementstring/g' foo
To act on several files in the
same directory, change the file
specification as needed, by
specifying foo*, *, or whatever
you need.
Note that perl uses the exact
same syntax for the actual string
substitution portion of the command
as sed does, which makes the command
syntax easy to remember. However,
perl performs the entire operation
on the file without the use of any
secondary files needing to be
created, which eliminates the extra
disk I/O and the potential
permissions and ownership issues.
This tip generously supported by: jem@postfive.rose.hp.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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3608 - December 26, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EAT YOUR PERL PIE
Mom always sed, "eat your Perl pie"!
A common task is to substitute
text strings within one or
more files. The sed string
substitution command is often
used to accomplish this, where
sed is passed a file name, the
string substitutions are written
to another file, and then that
file is copied over the first
file to effect the changes
desired in the original.
This approach has some inherent
problems. The command syntax is
lengthy and cumbersome, a
secondary file is created
which involves additional disk
I/O, and when that file is
copied or moved back over the
first one, permissions problems
and file ownership problems can
be created. If your umask
doesn't match the permissions of
the original file, then the
permissions of the final modified
file will be different than those
of the original. Likewise,
default ownerships and group
names are imposed on the temporary
copy, and if one is not careful,
when the temporary copy is written
back to the original file, these
can destroy the original file's
ownership and group information.
A much better way to accomplish
text substitution within a file or
group of files is to use the
"perl pie" approach, as shown here
on file foo:
perl -p -i -e 's/original text string/replacement string' foo
The above command will replace the
first instance of "original text
string" with "replacement string"
in file foo. If you want to
perform this globally within the
file, add the /g global specifier
at the back end, as follows:
perl -p -i -e 's/original text string/replacementstring/g' foo
To act on several files in the
same directory, change the file
specification as needed, by
specifying foo*, *, or whatever
you need.
Note that perl uses the exact
same syntax for the actual string
substitution portion of the command
as sed does, which makes the command
syntax easy to remember. However,
perl performs the entire operation
on the file without the use of any
secondary files needing to be
created, which eliminates the extra
disk I/O and the potential
permissions and ownership issues.
This tip generously supported by: jem@postfive.rose.hp.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
==========================================================================
Jumat, 25 Desember 2015
Unix Tip: CHANGING A PRINT QUEUE IP
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3607 - December 25, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
CHANGING A PRINT QUEUE IP
To change the IP address of
a print queue in HP UX 10.20
(and maybe others), go to
/var/spool/lp/interface.
Edit the file with the same
name as the print queue and
change parameter PERIPH to
the new IP address.
For example, to change
printer_1 from 127.0.0.2 to
127.0.10.10, edit
/var/spool/lp/interface/printer_1
and change the line PERIPH=127.0.0.2 to
PERIPH=127.0.10.10.
Disable and enable printer_1,
and jobs sent to printer_1 will
go to the new IP address.
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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 GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3607 - December 25, 2015
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
CHANGING A PRINT QUEUE IP
To change the IP address of
a print queue in HP UX 10.20
(and maybe others), go to
/var/spool/lp/interface.
Edit the file with the same
name as the print queue and
change parameter PERIPH to
the new IP address.
For example, to change
printer_1 from 127.0.0.2 to
127.0.10.10, edit
/var/spool/lp/interface/printer_1
and change the line PERIPH=127.0.0.2 to
PERIPH=127.0.10.10.
Disable and enable printer_1,
and jobs sent to printer_1 will
go to the new IP address.
--------------------------------------------------------------------------
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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
==========================================================================
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