will child processes be created when executing "ps"? Post: 302506660

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Top Forums Shell Programming and Scripting will child processes be created when executing "ps"? Post 302506660 by rbatte1 on Monday 21st of March 2011 02:07:30 PM

03-21-2011

Moderator

Could you tell us a little more, such as which operating system and any more about the script you are look for. Different operaing systems have variations on the ps command and it would be worth seeing the script to look for anything that might cause child processes.

ps in itself should not cause your script to spawn processes, but it may find itself which can be random depending on how the process gets scheduled in by the OS e.g.

Code:

$ ps -ef|grep myscript
12321 12311 0 11:22:33 pts/0 0:01 /home/fred/myscript
12335 12311 0 11:22:33 pts/0 0:01 ps -ef|grep myscript

You can get out of this random catch by using square brackets to exploit the shell expansion:-

Code:

$ ps -ef|grep myscrip[t]
12321 12311 0 11:22:33 pts/0 0:01 /home/fred/myscript

This will never match itself, but will find all variations of the phrase myscrip followed by anything in the brackets, um, that's a t then.

Let us know and hopefully someone can find the issue.

Robin
Liverpool/Blackburn
UK

rbatte1

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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)