Hi Thorsten. This is not a bug in the shellcheck binary, but in the man page. The correct way to use GNU-style long options is with two leading dashes, so you should type: shellcheck --list-optional
Probably the man page was written in a markup language that interpreted the two consecutive dashes as code for an en dash. Regards -- - <https://jorgemorais.gitlab.io/justice-for-rms/> - If an email of mine arrives at your spam box, please notify me. - Please adopt free/libre formats like PDF, ODF, Org, LaTeX, Opus, WebM and 7z. - Free/libre software for Replicant, LineageOS and Android: https://f-droid.org - [[https://www.gnu.org/philosophy/free-sw.html][What is free software?]]