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Traps for Signal Handling

Sets up trap handlers for signals like EXIT, INT, TERM, and ERR to ensure cleanup, graceful shutdown, and error recovery in Bash scripts.

BashResilience

Code

snippet
#!/usr/bin/env bash
set -euo pipefail

temp_files=()
cleanup_performed=false

cleanup() {
    if [[ "$cleanup_performed" == false ]]; then
        cleanup_performed=true
        echo "Performing cleanup..."
        for f in "${temp_files[@]}"; do
            [[ -f "$f" ]] && rm -f "$f"
        done
        echo "Cleanup complete"
    fi
}

on_error() {
    local line=$1
    echo "Error occurred at line $line" >&2
    cleanup
    exit 1
}

on_interrupt() {
    echo ""
    echo "Interrupted by user, cleaning up..." >&2
    cleanup
    exit 130
}

trap cleanup EXIT
trap 'on_error $LINENO' ERR
trap on_interrupt INT TERM

# Create temp files
for i in 1 2 3; do
    tmp=$(mktemp "/tmp/demo-$$-XXXXXX")
    temp_files+=("$tmp")
    echo "data $i" > "$tmp"
done

echo "Temp files created: ${temp_files[*]}"
echo "Processing..."
sleep 2
echo "Work complete"

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