Referenz und Spickzettel

#!/usr/bin/env bash
set -euo pipefail
trap 'rm -rf "$tmp"' EXIT
tmp=$(mktemp -d)

main() {
    local name=${1:-Welt}
    echo "Hallo, $name"
}
main "$@"

if cmd; then ...; elif ...; else ...; fi
case "$x" in a|b) ...;; *) ...;; esac
for i in {1..10}; do ...; done        for ((i=0;i<n;i++)); do ...; done
while cond; do ...; done              until cond; do ...; done
while IFS= read -r z; do ...; done < datei
break  continue  return  exit N

a=(x y z)    a+=(w)    ${a[0]}    "${a[@]}"    ${#a[@]}    ${!a[@]}    unset 'a[1]'
declare -A m;  m[key]=wert;  ${m[key]};  "${!m[@]}";  [[ -v m[key] ]]