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Top Forums UNIX for Beginners Questions & Answers Many processes running at the same time Post 303012891 by apmcd47 on Monday 12th of February 2018 06:48:13 AM
Old 02-12-2018
One example of using a flag, or lock file.
Code:
#!/bin/bash
myname=${0##*/}
if [[ -f /tmp/${myname} ]] 
then
    myname_proc=$(</tmp/${myname})
    if ps -p ${myname_proc} >/dev/null
    then exit
    else rm  /tmp/${myname} # assumption: last iteration of program died
    fi
fi
echo $$ > /tmp/${myname}
cleanup() {
    trap '' 0 HUP INT QUIT ABRT TERM # clear traps
    rm /tmp/${myname}
    # other cleanup here
}
trap 'cleanup' 0 # always run cleanup on exit
trap 'exit' HUP INT QUIT ABRT TERM # exit on one of these signals
# the rest of your script goes here

A good place to put such a file is the /tmp directory. The cleanup function should ensure that the file is deleted on exit, so you don't have to remember to put
Code:
rm /tmp/${myname}

everywhere you exit the program. Putting the PID in the file and then checking whether the process exists is optional, and there in case the program exits abnormally, leaving the file in place.

Andrew
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dbus-cleanup-sockets(1) 				      General Commands Manual					   dbus-cleanup-sockets(1)

NAME
dbus-cleanup-sockets - clean up leftover sockets in a directory SYNOPSIS
dbus-cleanup-sockets [DIRECTORY] DESCRIPTION
The dbus-cleanup-sockets command cleans up unused D-Bus connection sockets. See http://www.freedesktop.org/software/dbus/ for more informa- tion about the big picture. If given no arguments, dbus-cleanup-sockets cleans up sockets in the standard default socket directory for the per-user-login-session mes- sage bus; this is usually /tmp. Optionally, you can pass a different directory on the command line. On Linux, this program is essentially useless, because D-Bus defaults to using "abstract sockets" that exist only in memory and don't have a corresponding file in /tmp. On most other flavors of UNIX, it's possible for the socket files to leak when programs using D-Bus exit abnormally or without closing their D-Bus connections. Thus, it might be interesting to run dbus-cleanup-sockets in a cron job to mop up any leaked sockets. Or you can just ignore the leaked sockets, they aren't really hurting anything, other than cluttering the output of "ls /tmp" AUTHOR
dbus-cleanup-sockets was adapted by Havoc Pennington from linc-cleanup-sockets written by Michael Meeks. BUGS
Please send bug reports to the D-Bus mailing list or bug tracker, see http://www.freedesktop.org/software/dbus/ dbus-cleanup-sockets(1)
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