Linux

I like btop Maybe not really "unknown", but hey for those that don't know about it, check it out!

tmsu is pretty cool - it creates a little db and uses that to track tags on your files without ever touching them. It also has it's own little tag based filesystem.

GNU datamash (https://www.gnu.org/software/datamash/alternatives/) - handy tool for data munching. There's also https://github.com/BurntSushi/xsv

Bat, a cat alternative.

Lsd, an ls alternative.

Procs, a ps alternative.

Renane, because it's great.

all of them

Underrated

Both linked projects have over 60k+ stars on GitHub

Pick one

Underrated or not widely known?

I love lazygit and I'm still surprised at how many people are shocked when they see it for the first time. Not exactly a command, but a very handy text UI tool.

For more elementary tools, I can't believe how many people know about ! and ctrl+r who don't also know about fc and edit-and-execute-command.

People always sleep on script. It's badass and let's you do goofy things like this while keeping standard terminal formatting: https://github.com/StaticRocket/dotfiles/blob/043e9a56cc9515060188ec4642e4048c0dd6c000/dot_bashrc#L79-L94

motion

After spending years dealing with shady freeware and junk software on windows, I was floored by how easy and nonchalantly I was able to set up a simple security camera on my PC

Inshellisense is teaching me a lot. :) It's an autocompleter.

https://github.com/microsoft/inshellisense

Also, Atuin for history.

https://github.com/atuinsh/atuin

degit is a tool that will check out a git repo (or a specific branch or commit), but not set it up as a git repo. Basically just downloading a specific commit to a directory.

Lightweight sudo alternatives, hard to google too. I know ssu and rdo, please mention others.

As someone who has to do installs and admin at work a lot I'm constantly dealing with yum/dnf. I cry when I have to work with AIX.

find?