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Bash Trap Stack

Purpose

The traps.sh bash shell script allows you to create a stack of commands to execute for trap.

Commands

  • traps_start - registers the exit trap
  • traps_push $@ - pushes $@ as one entry to the stack
  • traps_pop - pops one entry from the stack and execute
  • traps_drop - pops one entry from the stack and do nothing
  • traps_isEmpty - returns 0 if empty, returns 1 if not empty
  • traps_stop - unregisters the exit trap if there is nothing on the stack
  • traps_cancel - unregisters the exit trap and remove all entries from the stack
  • traps_exit - unregisters the exit map and pops all entries from the stack
  • traps_diag - print the stack on pipe 1

User Variables

  • TRAPS_DEBUG=0 - provides more verbose output on pipe 2
  • TRAPS_SIGNAL=EXIT - controls the trap signal

Typical Sequence

  • traps_start
  • traps_push echo "test"
  • traps_pop
  • traps_stop

Notes

Tested against Bash 5. You can use set -eE along with TRAPS_SIGNAL=ERR before you start the trap stack to get the function and line number that triggered the trap.