1

background

bash 4.2

I have two files envar and main.sh

envar

... # displays a spinner so that user knows the job is under processing. spinner() { spin='-\|/' i=0 while kill -0 $1 2>/dev/null do i=$(( (i+1) %4 )) printf "\e[1;33m" printf "\r${spin:$i:1}" printf "\e[m" sleep .1 done } ...

main.sh

source envar very_slow_and_dangerous_function & pid=$! spinner $pid echo "$jobs done"

The problem

When someone press ctrl-c during spinner $pid the background shell becomes motherless.
I want both shells killed when ctrl-c or any other force signals happen.

How do I use Trap here?

Improve this question
2
  • 1
    How do you run these scripts? You mention bash but don't show a shebang or mention if you launch with bash main.sh or sh main.sh or something else. source is not portable, it's a bashishm for the standard . command. I doubt it will be relevant, but you never know. Commented Jul 27, 2021 at 10:18
  • @terdon I use shebang #!/bin/bash. Thank you for the insight I didn't know source was bash only. Commented Jul 28, 2021 at 0:43

1 Answer 1

Reset to default
1

You can try trapping SIGINT to kill 0 in envar:

$ cat envar trap "kill 0" SIGINT spinner() { spin='-\|/' i=0 while kill -0 $1 2>/dev/null do i=$(( (i+1) %4 )) printf "\e[1;33m" printf "\r${spin:$i:1}" printf "\e[m" sleep .1 done }

This will make the subshell also die. I tested with:

$ cat foo.sh #!/bin/bash ## source your function file . envar sleep 600 & pid=$! spinner $pid echo "$jobs done"

Running this and killing with Ctrl+C results in:

$ foo.sh /^CTerminated $ pgrep -c sleep 0
Improve this answer

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.