https://mkhl.grebedoc.dev/shellhaters/ I often use https://shellhaters.org to look up which details of the bourne shell and common command-line utilities are POSIX, and finally got around to updating it to the current POSIX 2024 standard (which includes the ever popular set -o pipefail, for example) find the result at the URL above or below or don't, I'm not your parent https://mkhl.grebedoc.dev/shellhaters/