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September 22, 2023 07:15
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Bash script to check if a script is already running.
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#!/bin/bash | |
dupe_script=$(ps -ef | grep "SCRIPT_NAME.sh" | grep -v grep | wc -l | xargs) | |
if [ ${dupe_script} -gt 2 ]; then | |
echo -e "The SCRIPT_NAME.sh script was already running!" | |
exit 0 | |
fi |
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consider looking at "pgrep", one for "-c" to count the pids and two for -f "for full path", three -u for uid running, and execute with fqfn so that the script is "/path/to/script/runtime.sh" not "runtime.sh". Now you can run multiple scripts of the same name and not get conflicts between them (eg, ~/bin/cron.sh and ~/test/cron.sh) and other user's cron.sh won't clash, or when you are editing cron.sh (eg, "emacs cron.sh")
https://man7.org/linux/man-pages/man1/pgrep.1.html