If you are wondering what all those files in /bin are, some of them exist, because they are part of the POSIX standard and have to be present in every POSIX com

If you are wondering what all those files in /bin are, some of them exist, because they are part of the POSIX standard and have to be present in every POSIX compliant system. A good overview over these commands can be found here: https://shellhaters.org/ https://shellhaters.org/ The links lead directly into the POSIX documents, which can be quite handy when you write shell scripts, because there you can read which options should be the same on every POSIX compliant OS.