run command before script exits

j0h

4/22/24, 12:24 AM

I have some hardware I'm testing with a bash script.

#!/bin/bash
tshwctl --setdio=65
for i in $(seq 0 1000)
do
 ./adc1
sleep 1
done
tshwctl --clrdio=65

If I press Ctrl+C before it is finished the loop, pin 65 will not be unset. (I can unset it later sure) is there a way to execute a process after pressing Ctrl+C? as in: is there a way for the script to execute tshwctl --clsdio=65 before the script exits when ctrl+C is pressed?

1 + 2

command-line

bash

scripts

steeldriver

4/22/24, 12:32 AM

Try putting it in a SIGINT trap - see for example [Can't trap (Ctrl^C) in my bash script](https://askubuntu.com/questions/524525/cant-trap-ctrlc-in-my-bash-script)

waltinator

4/22/24, 12:32 AM

Read `man bash`, the `trap` subcommand is what you need.

Score:2

Ubuntu

Gilles Quenot

4/22/24, 12:32 AM

You can use after the shebang #!/bin/bash:

trap 'tshwctl --clsdio=65 &>/dev/null' 1 2 3 15

or you can remove --clsdio from the bottom script and use:

trap 'tshwctl --clsdio=65 &>/dev/null' EXIT

to run the command in all EXIT use cases

http://mywiki.wooledge.org/SignalTrap

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: run command before script exits

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