How to find commands starting with a given letter like for example 's'?
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That's an interesting one.
You can type 's' and then type TAB for auto-completion. It will be give you all commands available in your path. Mind you, the list will be different when done as root (due to different $PATH).
it will list anything that has a man page, and give a brief description of the 'command' - while the one line description may be an advantage (it would be to me), but you didn't ask for that
most distros have a man page for everything - does yours (I'm guessing that some of the very 'small' distos may not)?
the things for which there are man pages goes a bit further than normal user commands and includes system calls; this is not a problem for me, you may not like it though
tried it on a bare-ish Ubuntu box and a rather heavily installed SuSE laptop; it was noticeably slower on the SuSE box, presumably due to the amount of 'stuff' concerned, and therefore the amount of stuff that goes through the filter, but be aware that YMMV.