Unix and Linux Tips

Jumat, 26 Desember 2008

Unix Tip: FILES OPENED BY A PROCESS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3247 - December 26, 2008

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

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FILES OPENED BY A PROCESS

This is supported on Sun Solaris, not too sure about other Unix flavours.

I badly wanted to find out all the files opened by a process, and that is when I found pfiles.

Usage :
/usr/proc/bin/pfiles <pid>

Where pid is the process-id of the process.

It lists the inode numbers of all the files, opened by that process.

This tip generously supported by: mdhar@miel.mot.com

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Kamis, 25 Desember 2008

Unix Tip: BACKUP THE REMOTE ESSENTIALS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3246 - December 25, 2008

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

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BACKUP THE REMOTE ESSENTIALS

There are many programs, data files, and especially license files that sit out on remote workstations and servers that you may should be backing up remotely.

If backing up the entire system puts a strain on your network, make sure that all the essential files at least get backed up.

Some files may be
/var/flexlm
/usr/local/flexlm
/var/netls
/var/license
/etc/passwd
/etc/hosts
/etc/groups
/etc/netgroups
/etc/shadow
/vmunix
/kernel
etc....

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Rabu, 24 Desember 2008

Unix Tip: STRING REMOVAL

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3245 - December 24, 2008

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

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STRING REMOVAL

What the following does:

rm `ls -al | grep str | awk '{if ($9 !~ /^str/) {print $9}'`

Removes all files that contains the string "str" excepts
those that begin with it. Changing the !~ to =~ does the
opposite.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Selasa, 23 Desember 2008

Unix Tip: KILLING MORE USERS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3244 - December 23, 2008

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

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KILLING MORE USERS

*** SORRY ABOUT THE PEVIOUS NULL TIP IF YOU RECEIVED IT****

To kill all processes of a particular user from root
at unix prompt type:

# kill -9 `ps -fu username |awk '{ print $2 }'|grep -v PID`

We can also use the username as an argument and pass it from
command line, if this command is put as a script.

This tip generously supported by: merveille@lucent.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Senin, 01 Desember 2008

Unix Tip: CHMOD THE SYSTEM

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3222 - December 1, 2008

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

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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.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Jumat, 03 Oktober 2008

Unix Tip: ALTERNATIVE TO CP

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3163 - October 3, 2008

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

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ALTERNATIVE TO CP

Define the following alias:

tar cvf - . | ( cd \!* ; tar xvf - )

or as an alias:

alias cpbytar 'tar cvf - . | ( cd \!* ; tar xvf - )'
(The alias definition above is for CSH)

To do a recursive copy of a directory to another location, preserving the PERMISSIONS and OWNERSHIP of the files. "cd" to the source location and invoke the following alias

cpbytar <destination_directory>

This tip generously supported by: bhavin@informix.com

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