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Full Discussion: Script executable only for one person at same time
Top Forums Shell Programming and Scripting Script executable only for one person at same time Post 302399702 by alister on Monday 1st of March 2010 09:44:30 AM
Old 03-01-2010
Hi DarkSwiss:

rev isn't required by posix, so it may not be on all systems.

By the way, just so you know, if it is very important that one and only one instance of the script be running at any instant, none of the above solutions will guarantee that. If the script is seldom run, you may never have a problem with them, but it is still possible for more than one instance to run.

Quote:
Originally Posted by bsnithin
Here is one way to do that without temporary files.
Code:
ps -eaf | grep test.sh | grep -v grep

# Between the last grep above and the exit status check that follows, there is
# no guarantee that the operating system won't schedule another process which
# will start up this script.  At that point, this instance mistakenly thinks that it
# is the only one.

if [ $? = 0 ]
then
echo "Script already running"
fi

vivekraj's solution is similarly affected.

Regards,
Alister
 

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LEARN ABOUT PHP

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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