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Full Discussion: Better to Use Return Code or wc -l Output?
Top Forums Shell Programming and Scripting Better to Use Return Code or wc -l Output? Post 302798049 by Yoda on Tuesday 23rd of April 2013 05:19:52 PM
Old 04-23-2013
If the process or utility is coded to return its exit code, I recommend using it to verify whether it succeeded or not.

If you do not have pgrep, use grep:
Code:
if ps -ef | grep [p]rocessName
then
      ...
fi

Here is the reason why I enclosed the first character inside square brackets:
Code:
$ ps -eaf | grep PatrolAgent
    yoda 29701 14851  0 16:12:47 pts/9     0:00 grep PatrolAgent
  patrol  1641     1 80  Mar 14  ?        1961:08 PatrolAgent

This will help you to save a pipeline for grep -v grep
Code:
$ ps -eaf | grep [P]atrolAgent
  patrol  1641     1 76  Mar 14  ?        1961:08 PatrolAgent

This User Gave Thanks to Yoda For This Post:
mrm5102
 

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LEARN ABOUT BSD

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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