topic Re: ipcs in awk-script in Operating System - Linux

ipcs in awk-script

Inesa Clinko — Wed, 16 Nov 2005 07:48:37 GMT

Please help me:
I want to find unused shared memory resources with "ipcs -smo" and remove it with "ipcrm", using awk-script from command line. If it needed, I can use temp.file.

Please show me an example.

Regards,Inesa

Re: ipcs in awk-script

Steven E. Protter — Wed, 16 Nov 2005 08:19:26 GMT

Hello Inesa,

ipcs -smo | grep | > /tmp/temp.file

while read a b c
do
ipcrm "-$a $c"
done < /tmp/temp.file

SEP

Re: ipcs in awk-script

A. Clay Stephenson — Wed, 16 Nov 2005 11:39:45 GMT

Be care using this, NATTCH = 0 is a necessary but not necessarily sufficient condition for the removal of a shared memory identifier. It all depends upon how the software that uses the shared memory was written. For example, it is not unusual for an initialization program to run and setup a shared memory segment and then detach and exit. In that case, NATTCH = 0 but additional programs could run later expecting that shared memory identifier to be available and crash. This is a fairly common method for programs that might require long initializations otherwise.

Re: ipcs in awk-script

Sandman! — Wed, 16 Nov 2005 18:50:30 GMT

Inesa,

Yet another way to do this would be:

# ipcs -smo | grep | awk '{system("ipcrm -"$1" "$2)}'

regards!

Re: ipcs in awk-script

Muthukumar_5 — Thu, 17 Nov 2005 01:10:59 GMT

Use like this:

ipcs -smo | awk '/^m|^s/ { print "ipcrm -"$1" "$2 }' | ksh

or

ipcs -smo | awk '/^m|^s/ { system ( "ipcrm -"$1" "$2); }'

hth.