Signals and Job Control Concepts

Trap Plan

Build a Cleanup Command

trap registers a command to run later, commonly on script exit. Planning the command as text makes cleanup behavior reviewable.

Program

Play the script to choose the cleanup target and build the trap command that would be registered.

trap_plan.sh 
#!/usr/bin/env bash

cleanup_target=
trap_command="rm -rf /tmp/$cleanup_target"
signal="EXIT"
plan="trap '$trap_command' $signal"
echo "$plan"

#!/usr/bin/env bash

cleanup_target=
trap_command="rm -rf /tmp/$cleanup_target"
signal="EXIT"
plan="trap '$trap_command' $signal"
echo "$plan"

#!/usr/bin/env bash

cleanup_target=
trap_command="rm -rf /tmp/$cleanup_target"
signal="EXIT"
plan="trap '$trap_command' $signal"
echo "$plan"
trap `trap 'command' EXIT` registers cleanup for script exit.
cleanup target Keeping the target in a variable makes the final cleanup command visible.
command plan This example prints a plan instead of deleting files.