[Devops] Fave command line tools?

[astera]

Ehlo devops,

I'm wondering, what are your most favourite - and probably hideously
ignored by the rest of the world - command line tools?

Like, for instance, just a while back I found out pretty much everyone
knew 'nice' - however, quite a number of sysadmins I asked hadn't yet
heard of or at least gotten around to use 'ionice'...

I'd really like to collect a list of some of those hidden & underrated
command line gems out there =)

Hack on,
/astera

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