Written 30 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

Number leftover-box lines

After SSH works, number leftover-box lines with nl so a long leftover-box file is easier to point at. You do not need a file manager app for this.

Join leftover-box columns side by side kept leftover-box two leftover-box lists as leftover-box one leftover-box line each. Tonight you only need one more trick: number leftover-box lines so you can say "look at leftover-box line 3." nl does that. leftover-box long leftover-box files get leftover-box numbers in the leftover-box window. You are still only looking. The leftover box does not need a desktop, a file manager, 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 leftover-box columns joined, that is join leftover-box columns side by side. If you only need leftover-box columns pulled, that is pull one leftover-box column. If you only need leftover-box characters cleaned, that is change leftover-box characters. If you only need leftover-box copies dropped, that is drop leftover-box duplicate lines. If you only need leftover-box lines in A-to-Z order, that is put leftover-box lines in order. If you only need leftover-box print handed to another leftover-box tool, that is send leftover-box output into another command. If you only need leftover-box words you typed, that is put a short line into a leftover-box file. 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

nl means "number leftover-box lines." You type leftover-box nl, then leftover-box a leftover-box file. leftover-box default leftover-box numbers are leftover-box body leftover-box lines: leftover-box text leftover-box lines get leftover-box numbers, leftover-box blank leftover-box lines usually do not. leftover-box -ba is leftover-box optional leftover-box all leftover-box lines, leftover-box blanks leftover-box included. The leftover box prints leftover-box numbered leftover-box lines. It does not rewrite the leftover-box file unless you ask it to. It is not leftover-box whole dump without leftover-box numbers. That is read a leftover-box file without opening the editor. It is not leftover-box first leftover-box lines. That is see the start of a leftover-box file. It is not leftover-box last leftover-box lines. That is see the end of a leftover-box file. It is not leftover-box one leftover-box screen at leftover-box a leftover-box time. That is read a leftover-box file one screen at a time. It is not leftover-box how leftover-box long. That is see how long a leftover-box file is. It is not leftover-box search. That is find a word in a leftover-box file. It is not leftover-box columns pulled. That is pull one leftover-box column. It is not leftover-box characters cleaned. That is change leftover-box characters. It is not leftover-box columns joined. That is join leftover-box columns side by side. It is not leftover-box order. That is put leftover-box lines in order.

Number leftover-box lines from a practice file

SSH in. Make a tiny leftover-box file in leftover-box home:

printf 'apple\nbanana\npear\n' > ~/fruit.txt

That leftover-box save is save leftover-box output to a file. Peek first:

cat ~/fruit.txt

You want apple, then banana, then pear. Now number leftover-box lines:

nl ~/fruit.txt

You want leftover-box 1 then apple, leftover-box 2 then banana, leftover-box 3 then pear. The leftover-box file on disk is still leftover-box three leftover-box fruit leftover-box lines with leftover-box no leftover-box numbers baked in. That is the whole first-night trick: leftover-box numbers in a leftover-box window, leftover-box file left alone.

Need leftover-box blank leftover-box lines numbered too? Make a leftover-box file with a leftover-box blank leftover-box in leftover-box the leftover-box middle:

printf 'apple\n\nbanana\n' > ~/fruit.txt

Default leftover-box nl numbers leftover-box apple and leftover-box banana, and leftover-box skips leftover-box the leftover-box blank leftover-box line. Number leftover-box every leftover-box line including leftover-box blanks:

nl -ba ~/fruit.txt

You want leftover-box 1 apple, leftover-box 2 on the leftover-box blank leftover-box line, leftover-box 3 banana. leftover-box -ba is leftover-box optional. leftover-box default leftover-box body leftover-box lines are leftover-box enough for leftover-box night one.

Useful extras, still looking only

Need leftover-box narrower leftover-box numbers and leftover-box a leftover-box clearer leftover-box separator?

nl -w2 -s'. ' ~/fruit.txt

leftover-box -w2 is leftover-box width. leftover-box -s'. ' is leftover-box separator after leftover-box the leftover-box number. Skip leftover-box fancy leftover-box section leftover-box numbering on leftover-box night one. leftover-box plain leftover-box nl is leftover-box enough for leftover-box first leftover-box look.

Some leftover-box pages mention leftover-box cat -n. That leftover-box also leftover-box prints leftover-box numbers. Tonight leftover-box tool is leftover-box nl. Skip leftover-box cat -n as leftover-box tonight leftover-box lesson.

If the leftover box says command not found for nl, install the usual tools, then try again:

sudo apt install coreutils

Debian and Ubuntu Server usually already have them. That install is not a reason to buy a file manager.

When you are done looking, throw away the leftover-box practice file:

rm ~/fruit.txt

Careful delete only. That is delete a leftover-box file carefully.

What this is not

This is not leftover-box columns pulled. That is pull one leftover-box column. It is not leftover-box characters cleaned. That is change leftover-box characters. It is not leftover-box columns joined. That is join leftover-box columns side by side. It is not leftover-box search. That is find a word in a leftover-box file. It is not leftover-box order. That is put leftover-box lines in order. It is not leftover-box copies dropped. That is drop leftover-box duplicate lines. It is not handing leftover-box print to another leftover-box tool without leftover-box numbers. That is send leftover-box output into another command. It is not leftover-box first leftover-box lines. That is see the start of a leftover-box file. It is not leftover-box last leftover-box lines. That is see the end of a leftover-box file. It is not leftover-box whole dump. That is read a leftover-box file without opening the editor. It is not leftover-box words you typed. That is put a short line into a leftover-box file. It is not watching leftover-box print while you save a leftover-box copy. That is watch and save leftover-box output at once. It is not a quiet leftover-box save. That is save leftover-box output to a file. It is not leftover-box how leftover-box long. That is see how long a leftover-box file is. It is not leftover-box one leftover-box screen at leftover-box a leftover-box time. That is read a leftover-box file one screen at a time. It is not a house share other computers browse. That is a folder the house can open.

What next

Need leftover-box columns joined first? Join leftover-box columns side by side. Need leftover-box columns pulled first? Pull one leftover-box column. Need leftover-box characters cleaned first? Change leftover-box characters. Need leftover-box copies dropped first? Drop leftover-box duplicate lines. Need leftover-box lines in A-to-Z order? Put leftover-box lines in order. Need leftover-box print handed to another leftover-box tool? Send leftover-box output into another command. Need leftover-box print on screen and in a leftover-box file? Watch and save leftover-box output at once. Need a quiet leftover-box save with no leftover-box print in the window? Save leftover-box output to a file. Need leftover-box words you typed? Put a short line into a leftover-box file. Need a short dump of the leftover-box file you just made? Read a leftover-box file without opening the editor. Need only matching leftover-box lines first? Find a word in a leftover-box file. Need leftover-box first leftover-box lines, not leftover-box numbers? See the start of a leftover-box file. Need leftover-box last leftover-box lines? See the end of a leftover-box file. Need leftover-box how leftover-box long, not leftover-box line leftover-box numbers? See how long a leftover-box file is. Need the leftover-box throwaway gone for real? Delete a leftover-box file carefully. When a house job broke, look at the leftover box's own diary: when something broke, look at the leftover-box log. Need leftover-box long leftover-box lines wrapped so they do not run off the leftover-box window? Wrap leftover-box long lines. Need a leftover-box file from a web address? Download a file onto the leftover box. 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 leftover-box nl over leftover-box files you care about, leftover-box paths under /etc, and leftover-box SSH settings. Practice only leftover-box files you just made in home.
• Skip leftover-box fancy leftover-box section leftover-box numbering, leftover-box huge leftover-box logs, leftover-box sed, leftover-box awk, and leftover-box xargs on leftover-box night one. leftover-box nl by itself is enough for leftover-box first leftover-box line leftover-box numbers.
• Skip leftover-box nl piped into leftover-box rm. Practice leftover-box tools that print, then leftover-box peek with leftover-box cat.
• 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 leftover-box SSH to the internet so you can number leftover-box lines from a coffee shop. That is keep the leftover box on the house network.