Revisiting all bash builtin commands

As I suggested in https://github.com/tldr-pages/tldr/pull/10579 and https://github.com/tldr-pages/tldr/pull/10580, all bash builtin commands should be revisited. They can easily be listed with help.

First of all their linked manual pages link to some Tcl programming language manuals like for example https://manned.org/while instead of anything useful like https://www.gnu.org/software/bash/manual/bash.html#index-while Secondly some of these commands might be fully POSIX compliant, but Windows doesn't care about POSIX. Thus they should be moved from common to linux. Ideally they'd be moved to *nix, but we don't have that category. Thirdly it needs to be considered which commands are exclusive to Bash, which commands apply to other *nix as well and which commands are POSIX compliant but with additions and edit the description to match that.

OS

[ ] Android
[X] Linux
[ ] macOS
[ ] sunOS
[ ] Windows

tldr-pages / tldr

Revisiting all bash builtin commands #10584

OS