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Full Discussion: Script function which checks if itself is already running
Top Forums Shell Programming and Scripting Script function which checks if itself is already running Post 302821911 by landossa on Sunday 16th of June 2013 04:32:37 AM
Old 06-16-2013
Script function which checks if itself is already running
Hi All,

I have a cron job set up which is set to run every 10 seconds.
What I need to do is have the script do a check to see if it is already running such that if it is running it wont fire up additional instances and processes according to its normal process.

For example if I have a script which checks to see if a file exists, and if exists, does a copy or move function of the file to another location, and then runs another process on it. If it is a large file that takes a long time to copy, and/or the other processes which I run on it takes a long time to complete, I don't want it to automatically fire up another instance of itself every 10 seconds.

So, lets say I have a script like the following: (and this isn't proper code, but just to illustrate the functions)

Code:
#!/bin/bash
#

1) Check to see if I am already running, and if so exit.

2) Check to see if file exists, and if it does process it.

EOF

What I am looking for is some way to determine if the script is running as in function 1.

Does anyone have any ideas how to achive this?

thanks,
landos
 

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LEARN ABOUT DEBIAN

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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