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Full Discussion: Script that checks for previous instances running
Top Forums Shell Programming and Scripting Script that checks for previous instances running Post 302120800 by jim mcnamara on Friday 8th of June 2007 08:50:07 AM
Old 06-08-2007
One way that does not use a pid - assuming the scrpit filename is somewhat unique:
Code:
ps -ef | grep ' <scriptfile> ' | grep -v ' <scriptfile >'

A simpler way to is to have a gentleman's agreement on a lock file, if this script has a very low probablility of failure.

When your script starts it looks in a "fixed file name" for 'I finished'. If it finds that, then it changes the file to read 'I am running', runs, then on exit resets the file to 'I finished'.

On startup, if the script finds 'I am running', it can exit with a note in the log file saying the other guy was still running. It can also wait, then check again as many times as you want.
 

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LEARN ABOUT MOJAVE

systemd-rc-local-generator

SYSTEMD-RC-LOCAL-GENERATOR(8)                               systemd-rc-local-generator                               SYSTEMD-RC-LOCAL-GENERATOR(8)

NAME

       systemd-rc-local-generator - Compatibility generator for starting /etc/rc.local and /usr/sbin/halt.local during boot and shutdown

SYNOPSIS

       /lib/systemd/system-generators/systemd-rc-local-generator

DESCRIPTION

       systemd-rc-local-generator is a generator that checks whether /etc/rc.local exists and is executable, and if it is pulls the
       rc-local.service unit into the boot process. This unit is responsible for running this script during late boot. Note that the script will
       be run with slightly different semantics than the original System V version, which was run "last" in the boot process, which is a concept
       that does not translate to systemd. The script is run after network.target, but in parallel with most other regular system services.

       systemd-rc-local-generator also checks whether /usr/sbin/halt.local exists and is executable, and if it is pulls the halt-local.service
       unit into the shutdown process. This unit is responsible for running this script during later shutdown.

       Support for both /etc/rc.local and /usr/sbin/halt.local is provided for compatibility with specific System V systems only. However, it is
       strongly recommended to avoid making use of these scripts today, and instead provide proper unit files with appropriate dependencies for
       any scripts to run during the boot or shutdown processes.

       systemd-rc-local-generator implements systemd.generator(7).

SEE ALSO

       systemd(1), systemctl(1)

systemd 237                                                                                                          SYSTEMD-RC-LOCAL-GENERATOR(8)
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