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Full Discussion: Bash if run a command
Top Forums Shell Programming and Scripting Bash if run a command Post 302920471 by Don Cragun on Thursday 9th of October 2014 02:29:40 PM
Old 10-09-2014
I don't understand what you're trying to do. On a system with no active message queues, shared memory segments, or semaphores, the output from ipcs will be something like:
Code:
iIPC status from <running system> as of Thu Oct  9 11:22:09 PDT 2014
T     ID     KEY        MODE       OWNER    GROUP
Message Queues:

T     ID     KEY        MODE       OWNER    GROUP
Shared Memory:

T     ID     KEY        MODE       OWNER    GROUP
Semaphores:

So, the output from:
Code:
ipcs|grep Shared|awk '{print $2}'

will be:
Code:
Memory:

and the condition in your if statement will always evaluate to false.

If, in addition to showing us code that doesn't work, you would also tell us what you're trying to do, we might be better able to help.

And, no. You do not want to enclose a command substitution in backquotes unless you are trying to perform a command substitution on the results of a command substitution.
 

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LEARN ABOUT LINUX

ipcs

IPCS(1) 						     Linux Programmer's Manual							   IPCS(1)

NAME

       ipcs - provide information on ipc facilities

SYNOPSIS

       ipcs [-asmq] [-tclup]
       ipcs [-smq] -i id
       ipcs -h

DESCRIPTION

       ipcs provides information on the ipc facilities for which the calling process has read access.

       The -i option allows a specific resource id to be specified.  Only information on this id will be printed.

       Resources may be specified as follows:

       -m     shared memory segments

       -q     message queues

       -s     semaphore arrays

       -a     all (this is the default)

       The output format may be specified as follows:

       -t     time

       -p     pid

       -c     creator

       -l     limits

       -u     summary

SEE ALSO

       ipcrm(1), ipcmk(1)

CONFORMING TO

       The  Linux  ipcs  utility is not fully compatible to the POSIX ipcs utility.  The Linux version does not support the -b and -o options, but
       does support the -l and -u options not defined by POSIX. The portable application shall not use the -a, -b, -o, -l, and -u options.

AUTHOR

       krishna balasubramanian (balasub@cis.ohio-state.edu)

AVAILABILITY

       The ipcs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

Linux 0.99							  9 October 1993							   IPCS(1)
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