trapping shell exit code
exit-code, shell, shell-trap, signals
Solution
`trap` dispatches on signals the process receives (e.g., from a `kill`), not on exit codes, with trap ... 0 being reserved for process ending. `trap /blah/blah 0` will dispatch on either `exit 0` or `exit 1`
Problem
I am working on a shell script, and want to handle various exit codes that I might come across. To try things out, I am using this script: ``` #!/bin/sh echo "Starting" trap "echo \"first one\"; echo \"second one\"; " 1 exit 1; ``` I suppose I am missing something, but it seems I can't trap my own "exit 1". If I try to trap 0 everything works out: ``` #!/bin/sh echo "Starting" trap "echo \"first one\"; echo \"second one\"; " 0 exit ``` Is there anything I should know about trapping HUP (1) exit code?