Written 29 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

Ask a leftover-box command what it does

After SSH works, ask a leftover-box command what it does with --help so you can read the short cheat sheet without leaving the window. Optional man for the longer page. You do not need a software store for this.

See where a leftover-box command lives told you if the tool is installed. Tonight you only need one more answer: what flags does it take? Most leftover-box tools print a short cheat sheet when you add --help. You are still only looking. The leftover box does not need a desktop, a software store, or a new mini PC for this one job.

Skip until SSH already works

SSH from the couch should already get you a leftover-box prompt. If you only need to know whether the tool exists, that is see where a leftover-box command lives. If you only need names in a folder, that is see what's in a leftover-box folder. Skip this whole note if you only need a house share other computers browse. That is a folder the house can open.

What this is

--help means "print the short cheat sheet." You can keep calling it "what does this do." You type the leftover-box tool name, then two dashes and the word help. The leftover box prints a short page of options, then drops you back at the prompt. It is not installing anything. It is not a web search. It is the tool talking about itself. Some older tools only answer to -h. Try --help first.

Ask a practice command for its cheat sheet

SSH in. Pick a leftover-box tool you already used. ls is a safe first try:

ls --help

You want a short flood of lines: usage at the top, then flags like -l and -a. That is the cheat sheet. You do not need to memorize it. Glance, then press Up and edit the real command.

Try the editor next:

nano --help

You want a short page about nano. If the leftover box says command not found, install only that one tool, then ask again:

sudo apt install nano

Then:

nano --help

If a tool ignores --help, try the short form:

ping -h

Careful: on some tools -h means something else. On ls, -h means human-readable sizes, not help. When the short form looks wrong, stick with --help.

Useful extras, still looking only

Need the longer manual for one night?

man ls

Space pages forward. b goes back. q leaves. Same keys as read a leftover-box file one screen at a time. If man itself is missing, install the manuals once:

sudo apt install man-db

Night one still prefers --help. It is shorter, and you stay at the prompt when it finishes.

Confirm the tool exists before you ask it for help:

command -v ls

A path means go. A blank window means install that one tool first. That is see where a leftover-box command lives.

When the cheat sheet is long, page it:

ls --help | less

Space turns the page. q leaves. Same idea as reading a long leftover-box file. That leftover-box bar is send leftover-box output into another command.

When you are done looking, you do not need to delete anything. This note only prints text.

What this is not

This is not a search for whether the tool is installed. That is see where a leftover-box command lives. It is not a dump of a leftover-box file. That is read a leftover-box file without opening the editor. It is not flipping back through lines you already typed. That is reuse a leftover-box command you already typed. It is not installing a package store or a "software center." One missing tool is sudo apt install for that one name. It is not a house share other computers browse. That is a folder the house can open.

What next

Need to hand the leftover-box cheat sheet to another leftover-box command? Send leftover-box output into another command. Need to park leftover-box command print in a leftover-box file? Save leftover-box output to a file. Need to know if the tool is even there? See where a leftover-box command lives. Need the editor after the cheat sheet pointed at a flag? Edit a leftover-box file from the couch. Need names in a folder again? See what's in a leftover-box folder. Need to flip back through lines you already typed? Reuse a leftover-box command you already typed. When a house job broke, look at the leftover box's own diary: when something broke, look at the leftover-box log. When key login is boring on every computer you use, turn off leftover-box password login once the key works. Keep SSH on the house network: keep the leftover box on the house network. Do not forward port 22.

Skip

• Skip if SSH still fails. Finish SSH from the couch first.
• Skip buying a software store, Softaculous, or a new mini PC because one leftover-box cheat sheet looked long. Glance, then try the real command.
• Skip deep info pages, apropos, and installing every -doc package on night one. --help is enough for the first look.
• Skip copying random flags from a blog into /etc just because the cheat sheet listed them. Practice only on leftover-box tools you already met.
• Skip leftover-box SSH settings, /etc/shadow, and anything under /etc/ssh. Looking at trusted laptop keys is see which laptop keys the leftover box already trusts.
• Skip opening SSH to the internet so you can read help pages from a coffee shop. That is keep the leftover box on the house network.