ps -ef Post: 302076876

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Top Forums UNIX for Advanced & Expert Users ps -ef Post 302076876 by Kamali on Friday 16th of June 2006 10:34:49 AM

06-16-2006

Registered User

ps -ef

Hi

In a script we are checking if any other instance of the same script is running to make sure that we don't run multiple threads, and if there is only one then we are proceeding otherwise coming out of it ..
To do this we check as below,
ps -ef | grep -i 'scriptname' | grep -v grep | wc -l

this at times returns 2, but when I try to display
ps -ef | grep -i 'scriptname' | grep -v grep

it shows only the current instance that is getting started ..
Can anyone please help me in figuring out the problem.

Many thanks

Kamali

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LEARN ABOUT X11R4

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)