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Top Forums Shell Programming and Scripting check that script is not running twice Post 15873 by Link_02 on Wednesday 20th of February 2002 06:17:28 PM
Old 02-20-2002
Quote:
Originally posted by PxT
Easiest way is:

ps -ef | grep "[l]d_data" || ld_data


That will run the program "ld_data" if and only if it is not found already running. Placing the first character within square brackets protects the "grep" command line from being found and triggering a false positive.

Thank you
 

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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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