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Top Forums Shell Programming and Scripting About ps -ef and if-else problems Post 302737435 by elixir_sinari on Thursday 29th of November 2012 03:29:02 AM
Old 11-29-2012
1) In case of a pipeline, the exit status is that of the last command (unless the shell supports the pipefail option and that is set). So, the exit status is that of grep -v grep, which will be 0 if it anything passes through this grep command to standard output.
In short, if the process is running, this will return a 0 (success).

2) No. That means if not 1 which might not be the same as if 0.

3) Yes.
 

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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 is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, 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 zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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