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I have below script running as background process.

#!/bin/sh while true; do : done email_kill_alert() { echo "" | mailx -s "scritp received kill signal." emailid }

Above script is run as background process with nohup command. I want it to trigger email_kill_alert function to send out email as soon as script or process ID gets killed. I have been reading about use of trap but not sure how I implement it. Note that while loop is infinite as it constantly checks for a files.

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Put this before the while loop: trap 'email_kill_alert' KILL

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  • I would suggest to use SIGKILL SIGTERM SIGINT instead of KILL. Commented Oct 9, 2019 at 9:34
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    How can trapping KILL work? SIGKILL can’t be caught (or ignored). Commented Oct 9, 2019 at 9:49
  • Thank you so much guys. it worked. I used below, above while loop. trap 'email_kill_alert' SIGKILL SIGTERM SIGINT Commented Oct 9, 2019 at 20:24
  • There is another problem here. I run above script with command "nohup bash scirpt.sh &" in background. When I use "kill PID", it sends email but PID still running. And when I use "kill -9 PID", it does not send email and PID is killed. How can I make sure using "kill PID" command, it kills PID with email sent and using "kill -9 PID" it sends email with PID killed? Commented Oct 10, 2019 at 3:17

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