Cleanup temp dir via trap bash
Auto-remove mktemp dir on exit/signal; note: quote $tmp to survive spaces
tmp=$(mktemp -d); trap 'rm -rf "$tmp"' EXIT INT TERM
more bash
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Diff two command outputs
diff <(kubectl get cm a -o yaml) <(kubectl get cm b -o yaml)
Read file lines into array safely
mapfile -t lines < file.txt; printf '%s\n' "${lines[@]}"
Parameter expansion toolkit
f=/var/log/app.log.gz; echo "${f##*/}" "${f%.*}" "${f//log/LOG}"
Regex capture with BASH_REMATCH
[[ $s =~ ^([0-9]+)\.([0-9]+) ]] && echo "${BASH_REMATCH[1]}/${BASH_REMATCH[2]}"
Parallel xargs over null-delimited input
find . -name '*.log' -print0 | xargs -0 -P"$(nproc)" -n1 gzip