Mine you, this page is clearly targeted at an audience who’ve never opened a shell before; they’re all quite common, and it’s almost impossible to have spent any time in bash, zsh, or any bash-ish shell without encountering or using these. Also, a couple are not going to work at all in non-standard shells like fish, nushell, or even more common shells like ash, BusyBox, or the venerable csh, because they’re bash built-ins. There’s dependency on the GNU toolset, too; some of these commands won’t work on FreeBSD, even when running bash, because the SysV tools have different argument lists.
Mine you, this page is clearly targeted at an audience who’ve never opened a shell before; they’re all quite common, and it’s almost impossible to have spent any time in bash, zsh, or any bash-ish shell without encountering or using these. Also, a couple are not going to work at all in non-standard shells like fish, nushell, or even more common shells like ash, BusyBox, or the venerable csh, because they’re bash built-ins. There’s dependency on the GNU toolset, too; some of these commands won’t work on FreeBSD, even when running bash, because the SysV tools have different argument lists.