shell - Is trap EXIT required to execute in case of SIGINT or SIGTERM received? -

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i have simple script

trap 'echo exit' exit while true; sleep 1; done

and behaves differently in different shells:

$ bash tst.sh ^cexit $ dash tst.sh ^c $ zsh tst.sh ^c $ sh tst.sh ^cexit

so i'm not sure how should operate , whether specified @ all.

the exit trap isn't working same way in every shell. few examples:

  • in dash , zsh it's triggered regular exit within script.
  • in zsh, if trap signal quit execution, need restore default behaviour explicitly calling exit.

i'd suggest catch signals , exit, should portable across shells:

$ cat trap trap 'echo exit; exit' int term  # , other signals while true; sleep 1; done $ bash trap ^cexit $ dash trap ^cexit $ zsh trap ^cexit $ ksh trap ^cexit $ mksh trap ^cexit $ busybox sh trap ^cexit

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