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Full Discussion: detecting multiple instances
Top Forums Shell Programming and Scripting detecting multiple instances Post 302113381 by vgersh99 on Thursday 5th of April 2007 02:34:36 PM
Old 04-05-2007
here's the paradigm I usually use on Solaris of detecting another instance of the same running script. If another instance IS detected, the current (the calling instance) will exit allowing the 'older' instance to finish its work.

It's not exactly what you want, but might be a good starting point:

Code:
#!/bin/ksh
thisFILE="$(whence ${0})"

progNameFull="${0##*/}"
progName="${progNameFull%%.*}"

AWK='/bin/nawk'
FUSER='/usr/sbin/fuser'

#----------------------------------------------------------------------
# see if there's another instance of THIS script running - don't allow MULTIPLE
# instances of the same script running at the same time. If there's a previously
# invoked instance of this script running, log an error message and exit THIS
# current invocation of the script - allow the previously invoked script finish
# its own workload.
     myPID="$$"
     FUSERout=$(${FUSER} ${thisFILE} 2>/dev/null)
     # echo "fuser ->[${FUSERout}]"
     typeset -i numProc=$(echo "${FUSERout}" | ${AWK} '{print NF}')
     if [[ "${numProc}" -gt 1 ]] ; then
        echo "${progName}::main Error: another instance(s) of [${thisFILE}] is currently still running [$(echo ${FUSERout} | sed -e 's/  */ /g')] - exiting THIS [${myPID}] run."
        exit 1
     fi

 

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LEARN ABOUT CENTOS

vlvindex

VLVINDEX(8)						      System Manager's Manual						       VLVINDEX(8)

NAME

       vlvindex - Directory Server script for VLV indexing

SYNOPSIS

       vlvindex [-Z serverID] -n backendname | {-s includesuffix}* -T vlvTag [-d debuglevel] [-h]

DESCRIPTION

       Creates	virtual  list  view (VLV) indexes, known in the Directory Server Console as browsing indexes. VLV indexes introduce flexibility in
       the way search results are viewed.  VLV index configuration must already exist prior to running this script. The Directory Server  must	be
       stopped before running this script.

OPTIONS

       A summary of options is included below:

       -Z Server Identifier
	      The server ID of the Directory Server instance.  If there is only one instance on the system, this option can be skipped.

       -n Backend Name
	      The name of the LDBM database to reindex.  Example: userRoot

       -s includeSuffix
	      Specifies suffixes to be included or the subtrees to be included

       -T vlvTag
	      This is the name of the vlv index entry under cn=config.

       -d Debug Level
	      Settings the debugging level.

       -h
	      Display the usage.

EXAMPLE

       vlvindex -n userRoot -T myVLVIndex -Z instance2

DIAGNOSTICS

       Exit status is zero if no errors occur.	Errors result in a non-zero exit status and a diagnostic message being written to standard error.

AUTHOR

       vlvindex was written by the 389 Project.

REPORTING BUGS

       Report bugs to http://bugzilla.redhat.com.

COPYRIGHT

       Copyright (C) 2013 Red Hat, Inc.

								    Mar 5, 2013 						       VLVINDEX(8)
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