Linux

"Advanced Linux Commands You've Probably Never Used"

ping

^foo^bar Command – Quick Text Substitution

doesn't work for me (using fish) and is apparantly only available in bash; would you call that then a command?

at Command – Schedule One-Time Tasks

at is also not a built-in but an external tool you have to install first; but its an interesting one.

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.

du -sh * | sort -h is a thing I type frequently.

Just thinking of commands I need to learn, and I think chroot is up there. Iirc, you can recover from some extremely bad system states with an ISO and chroot.

I understand the basics of what it does from it's description, I just haven't really dived deep enough to feel comfortable with it.