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Clean up shell artifacts on exit with trap

Apparently, this is the “idiomatic” way to clean up after yourself in shell/bash. The trap calls the command when the program exits. A kill -9 would bypass the trap, however.

TMP_DIR="$(mktemp -d)"
# shellcheck disable=SC2064 # intentionally expands here
trap "rm -rf \"$TMP_DIR\"" EXIT INT TERM

Note that trap has “events” in addition to the normal signals.

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