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Full Discussion: Bash if run a command
Top Forums Shell Programming and Scripting Bash if run a command Post 302920388 by MadeInGermany on Thursday 9th of October 2014 06:32:14 AM
Old 10-09-2014
You need a space after the [ and before the closing ]
Code:
if [ "$(ipcs | grep Shared | awk '{print $2}')" = "Shared" ]; then

Shorter is
Code:
if [ "$(ipcs | awk '/Shared/ {print $2}')" = "Shared" ]; then

Both are not portable.
 

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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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