Unix and Linux Tips

Kamis, 11 November 2010

Unix Tip: KILLING ALL USER PROCESSES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3563 - November 11, 2010

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

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KILLING ALL USER PROCESSES

The common method for killing all of a users processes
usually involves grepping the users name from 'ps', then
using awk to get the process id's and submitting them
to 'kill -9'.

Sys V
ex: kill -9 $(ps -fuusername | awk '{ print $2 }' )

BSDish
ex: kill -9 $(ps -aux |grep username | awk '{ print $2 }' )

The problems with doing this way are that it is slow, and
more importantly, it doesn't always kill all of the processes
on the first try.

There is a way to do this that always kills all of the users
processes the first time, and is very fast:

su - username -c 'kill -9 -1'

This tip generously supported by: jkstill@teleport.com

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Rabu, 10 November 2010

Unix Tip: NFS HANG FIX ON HP-UX

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UNIX HOT TIP

Unix Tip 3562 - November 10, 2010

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

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NFS HANG FIX ON HP-UX

In an NFS environment (Hp-UX based), sometimes no user is
able to log-in when home directories are mounted using automounter).
As user validation occurs, the user .profile is executed but no shell
prompt appears unless the user presses CTRL-C.

The Solution to this is to kill the portmap & inetd and restart
the two daemons. The problem will then be sorted out.

This tip generously supported by: sgogia@hss.hns.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Selasa, 09 November 2010

Unix Tip: REGEXP MATCHING IN AWK

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3561 - November 9, 2010

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

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REGEXP MATCHING IN AWK

If you ever find yourself typing "command | grep pattern | awk '{print $3}'
you can shorten this by using the regexp matching in awk, like this:

command | awk '/pattern/{print $3}'

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Senin, 08 November 2010

Unix Tip: Public Relations

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3560 - November 8, 2010

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

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Public Relations

One of the best things an admin can do
is to have good public relations with
the user community.

Don't just be there when problems arise.
Go out to the user community when things are
working. High visibility is the key.

If the users see you around and there are no
problems they will believe that you care to
take the time for them.

Try not to let the users always go come to you.

Go to those users that you never here from
The perfect users, the ones that leave you
alone. Often the don't have an understanding
of what you can do for them.

I know many will say, "I don't have time!"
Just a calm walk through a department is
really all it takes, sometimes you never
have to stop.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Minggu, 07 November 2010

Unix Tip: CLEANUP AT LOGOUT

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UNIX HOT TIP

Unix Tip 3559 - November 7, 2010

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

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CLEANUP AT LOGOUT

The following c-shell .logout script will clear your Netscape
cache. No action will be taken if Netscape is current running.

------------------- CUT HERE ------------------------------
#!/bin/csh

if !( `ps -eu $USER | grep netscape | grep -v grep | sed -e 's/^ *//' -e 's/ .*//'` ) then
echo
echo "Clearing Netscape cache..."
\rm -rf ~/.netscape/cache/*
endif

echo
echo "Exiting..."

------------------- CUT HERE ------------------------------
This tip generously supported by: rb237@phy.cam.ac.uk

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Sabtu, 06 November 2010

Unix Tip: SPEED UP INTERACTION TIME

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3558 - November 6, 2010

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

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SPEED UP INTERACTION TIME

One way to speed up the interaction time of
a shell (that does not hash its commands)
that you may overlook is to modify your path.
The order of the directories in your path
should rely on the number of commands you use
most. So /usr/bin or /bin would probably be first.
Very large directorys that are mounted over
the network should be later in the list. If
there are some directories in your path you only
use for one or two commands consider making an
alias or shell script (if your shell doesn't
support aliases) which calls the program with its
full path name.

Watch out when sourcing files, especially when
your root. It could modify your path and make
you run something detrimental to your system.
Getting into the habit of using full pathnames
is the key here.