This is a text-only version of the following page on https://raymii.org: --- Title : Bash Bits: Trap Control C (SIGTERM) Author : Remy van Elst Date : 14-09-2013 URL : https://raymii.org/s/snippets/Bash_Bits_Trap_Control_C_SIGTERM.html Format : Markdown/HTML --- Bash Bits are small examples and tips for Bash Scripts. This bash bit shows you how to capture a Control C signal in a bash script, for example, to clean up any temp or pid files when your script is killed or closed.

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[All Bash Bits can be found using this link][2] Exit signals are sent when for example you use `pkill` or `killall`. If you do not specify a number, a `SIGTERM` is sent. If you for example do a `pkill -9 firefox`, it sents a `SIGKILL`. If you have a bash script which places a temp file, or a pid file, you might want to clean that up before you exit. We create a function to catch the exit signals first, then we bind this function to the exit signals. This is the `control_c` function: function control_c { echo -en "\n## Caught SIGINT; Clean up and Exit \n" rm /var/run/myscript.pid exit $? } Then we use the trap command to bind the function to an exit signal. Here I bind it to both `SIGINT` and `SIGTERM`: trap control_c SIGINT trap control_c SIGTERM Now when the script gets killed or you do a control c, the script will remove it's pid file. You can put anything in the `control_c` function, I mostly use it for cleanup. [Read more about Signals here on The Linux Documentation Project][3] [1]: https://www.digitalocean.com/?refcode=7435ae6b8212 [2]: https://raymii.org/s/tags/bash-bits.html [3]: http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_12_01.html --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.