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Full Discussion: locking mechanism
Top Forums Shell Programming and Scripting locking mechanism Post 302239251 by jim mcnamara on Tuesday 23rd of September 2008 07:33:08 AM
Old 09-23-2008
Code:
#!/bin/ksh

lockit()
{
     [[ -w /tmp/lockfile ]] ||  > /tmp/lockfile
     let count=0
     echo 'checking lock...'
     while [[ -s /tmp/lockfile ]]
     do
           sleep 30           
           count=#(( count  + 1 ))
           if [[ count -eq 10 ]] ; then
                  echo 'cannot obtain lock'
                  exit 1
           fi
     done
      echo "$$" > /tmp/lockfile
     echo 'got lock'
}

unlock()
{
      > /tmp/lockfile

}
# main --------------------------
lockit

trap '> /tmp/lockfile; kill -9 $$ ' EXIT  HUP  INT

.  /path/to/myscript.sh
STATUS=$?

unlock
trap ' ' EXIT
exit $STATUS

Put your scriptname inside this type of script. If your script has trap commands they may override the ones here. This is just meant as a simple starting point.
 

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INSTALLSIEVE(1) 					      General Commands Manual						   INSTALLSIEVE(1)

 *

NAME
installsieve - user utility for managing sieve scripts SYNOPSIS
installsieve DESCRIPTION
installsieve is a utility that allows users to manage their sieve scripts kept on the server. OPTIONS
-v <name> View script with the given name. The script if retrieved sucessfully is output to standard output. -l List all of the scripts currently on the server. If one of the scripts is active a arrow is printed indicating that it is the active script. -p <port> Port to connect to. If left off this defaults to "sieve" as defined in /etc/services. -i <file> Install a file onto the server. If a script with the same name already exists on the server it is overwritten. Upon sucessfully putting the script on the server the script is set active. If <file> has the extension .script it is chopped when put on the server since sieve names may not contain a '.'. -a <name> Set <name> as the active script. The list of available names can be obtained from the '-l' option.. -d <name> Delete the sieve script on the server with <name>. -m <mechanism> Force installsieve to use <mechanism> for authentication. If not specified the strongest authentication mechanism is chosen. -g <name> Get the sieve script with <name> and save it to disk with a ".script" extension. If a file with that name already exists it is overwritten. -u <user> Userid/Authname to use for authentication; by default, the current user. CMU
Project Cyrus INSTALLSIEVE(1)
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