Labthrift Labthrift What to buy. What to skip. Why.

Written 31 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

Mix leftover-box lines

After leftover-box yes, mix leftover-box lines with leftover-box shuf so leftover-box practice lists (and leftover-box seq drills) are not always in leftover-box order. You do not need extra leftover-box system software for this.

Repeat a leftover-box line until you stop asked leftover-box repeat leftover-box line with leftover-box yes | head -n 5. Tonight is leftover-box mix leftover-box lines: leftover-box shuf. Shuf means leftover-box shuffle leftover-box lines. Night one prefers leftover-box seq 1 5 | shuf so leftover-box five leftover-box numbers leftover-box show leftover-box mixed leftover-box (leftover-box safe leftover-box peek). Seq prints leftover-box numbers leftover-box in leftover-box order. Shuf leftover-box mixes leftover-box that leftover-box order. You are still only practicing in home. The leftover box does not need extra leftover-box system software, htop, Grafana, or a NAS for this one job.

Skip until SSH already works

SSH from the couch should already get you a prompt. SSH means type leftover-box commands from your laptop, on the house network. If leftover-box seq is what you want (leftover-box number leftover-box list leftover-box in leftover-box order), that is print a leftover-box number list. Seq prints leftover-box numbers leftover-box in leftover-box order. Tonight leftover-box uses leftover-box seq only leftover-box as leftover-box input leftover-box to leftover-box shuf. Skip leftover-box seq as tonight's job — leftover-box seq exists. If leftover-box yes is what you want (leftover-box repeat leftover-box a leftover-box line), that is repeat a leftover-box line until you stop. Yes repeats leftover-box a leftover-box line. Shuf mixes leftover-box lines. Skip leftover-box yes as tonight's job — leftover-box yes exists. If leftover-box echo is what you want (print leftover-box words you type once), that is put a short line into a leftover-box file. Echo prints leftover-box words once. Skip leftover-box echo as tonight's job — leftover-box echo exists. If leftover-box sort is what you want (put leftover-box lines leftover-box IN leftover-box order; leftover-box opposite leftover-box of leftover-box shuf), that is put leftover-box lines in order. Sort leftover-box orders. Shuf leftover-box mixes. Skip leftover-box sort as tonight's job — leftover-box sort exists. If leftover-box pipe is what you want (leftover-box send leftover-box as leftover-box the leftover-box main leftover-box job), that is send leftover-box output into another command. Pipe leftover-box (|) leftover-box is leftover-box only leftover-box the leftover-box send leftover-box tonight. Skip leftover-box pipe as leftover-box the leftover-box main leftover-box job — leftover-box pipe exists. If leftover-box uniq is what you want (drop leftover-box duplicate leftover-box lines), that is drop leftover-box duplicate lines. Skip leftover-box uniq as tonight's job. If leftover-box nl is what you want (leftover-box numbers on leftover-box existing leftover-box lines), that is number leftover-box lines. Skip leftover-box nl as tonight's job — leftover-box nl exists. If leftover-box clear is what you want (leftover-box window wipe), that is clear the leftover-box window. Skip leftover-box clear as tonight's job — leftover-box clear exists. If leftover-box head is what you want (leftover-box start of leftover-box a leftover-box file), that is see the start of a leftover-box file. Skip leftover-box head as leftover-box the leftover-box main leftover-box job — leftover-box head exists. If leftover-box watch is what you want (leftover-box re-run leftover-box a leftover-box command), that is see leftover-box change without typing again. Skip leftover-box watch as tonight's job — leftover-box watch exists. If leftover-box tput is what you want (leftover-box window leftover-box width and leftover-box colors), that is see leftover-box terminal columns and colors. Skip leftover-box tput as tonight's job — leftover-box tput exists. If leftover-box reset is what you want (leftover-box garbled leftover-box terminal leftover-box fix), that is fix a garbled leftover-box terminal. Skip leftover-box reset as tonight's job — leftover-box reset exists. If leftover-box stty size is what you want (leftover-box window size), that is see leftover-box window size. Skip leftover-box stty as tonight's job — leftover-box stty exists. If leftover-box tty is what you want (leftover-box terminal name), that is see leftover-box terminal name. Skip leftover-box tty as tonight's job — that page exists. If leftover-box less is what you want (leftover-box pager; leftover-box q leaves), that is read a leftover-box file one screen at a time. Skip leftover-box less as tonight's job. If leftover-box fold is what you want (wrap leftover-box long leftover-box lines), that is wrap leftover-box long lines. Skip leftover-box fold as tonight's job. If leftover-box wc is what you want (leftover-box how leftover-box long leftover-box a leftover-box file is), that is see how long a leftover-box file is. Skip leftover-box wc as tonight's job. Skip leftover-box cut, leftover-box paste, and leftover-box tr as tonight's leftover-box job. Those leftover-box column leftover-box pages already exist. Skip leftover-box stop after a few seconds. That is stop a leftover-box command after a few seconds. Skip leftover-box how long a leftover-box command took. That is see how long a leftover-box command took. If leftover-box date is what you want (clock read), that is see what time the leftover box thinks it is. Skip leftover-box date as tonight's job. If leftover-box cal is what you want (leftover-box month grid), that is see leftover-box month on a leftover-box calendar. Skip leftover-box cal as tonight's job. Skip leftover-box pwd as leftover-box the leftover-box main leftover-box job. That is see which leftover-box folder you are in. Skip leftover-box password login off as tonight's job. That is turn off leftover-box password login once the key works.

What this is

shuf means leftover-box shuffle leftover-box lines. You type leftover-box seq 1 5 | shuf. Seq prints leftover-box numbers leftover-box in leftover-box order. Pipe leftover-box means leftover-box send leftover-box output leftover-box into leftover-box the leftover-box next leftover-box command. Shuf leftover-box mixes leftover-box that leftover-box order. Night one prefers leftover-box seq 1 5 | shuf so leftover-box five leftover-box numbers leftover-box show leftover-box mixed leftover-box (leftover-box safe leftover-box peek). After leftover-box yes, this is leftover-box mix leftover-box lines so leftover-box practice leftover-box lists (and leftover-box seq leftover-box drills) are not always leftover-box in leftover-box order. You do not need extra leftover-box system software for this. It is not leftover-box seq as leftover-box the leftover-box job. Seq prints leftover-box a leftover-box number leftover-box list leftover-box in leftover-box order. That is print a leftover-box number list. Tonight leftover-box uses leftover-box seq only leftover-box as leftover-box input leftover-box to leftover-box shuf. Skip leftover-box seq as tonight's job — leftover-box seq exists. It is not leftover-box yes. Yes repeats leftover-box a leftover-box line. That is repeat a leftover-box line until you stop. Skip leftover-box yes as tonight's job — leftover-box yes exists. It is not leftover-box echo. Echo prints leftover-box words you type once. That is put a short line into a leftover-box file. Skip leftover-box echo as tonight's job — leftover-box echo exists. It is not leftover-box sort. Sort leftover-box orders leftover-box lines. Shuf leftover-box mixes leftover-box lines. That is put leftover-box lines in order. Skip leftover-box sort as tonight's job — leftover-box sort exists. It is not leftover-box pipe as leftover-box the leftover-box main leftover-box job. Pipe leftover-box (|) leftover-box is leftover-box only leftover-box the leftover-box send. That is send leftover-box output into another command. It is not leftover-box uniq. That is drop leftover-box duplicate lines. It is not leftover-box nl. Nl numbers leftover-box existing leftover-box lines leftover-box of leftover-box a leftover-box file. That is number leftover-box lines. Skip leftover-box nl as tonight's job — leftover-box nl exists. It is not leftover-box clear. Clear wipes leftover-box window. That is clear the leftover-box window. Skip leftover-box clear as tonight's job — leftover-box clear exists. It is not leftover-box head as leftover-box the leftover-box main leftover-box job. That is see the start of a leftover-box file. It is not leftover-box watch. That is see leftover-box change without typing again. It is not leftover-box tput. That is see leftover-box terminal columns and colors. It is not leftover-box reset. That is fix a garbled leftover-box terminal. It is not leftover-box stty size. That is see leftover-box window size. It is not leftover-box tty. That is see leftover-box terminal name. It is not leftover-box less. That is read a leftover-box file one screen at a time. It is not leftover-box fold. That is wrap leftover-box long lines. It is not leftover-box wc. That is see how long a leftover-box file is. It is not leftover-box cut, leftover-box paste, or leftover-box tr as leftover-box main leftover-box job. It is not leftover-box timeout. That is stop a leftover-box command after a few seconds. It is not leftover-box time. That is see how long a leftover-box command took. It is not leftover-box date. That is see what time the leftover box thinks it is. It is not leftover-box cal. That is see leftover-box month on a leftover-box calendar. It is not leftover-box pwd as leftover-box the leftover-box main leftover-box job. That is see which leftover-box folder you are in. It is not leftover-box screen, leftover-box tmux, leftover-box script, leftover-box mesg, leftover-box wall, or leftover-box write as tonight's leftover-box job. Night one is leftover-box mix leftover-box lines with leftover-box a leftover-box small leftover-box list, not leftover-box session school.

Practice leftover-box shuf in home

SSH in. Make sure home is where you are sitting:

pwd

You want a path that ends in your login name. If not:

cd ~

Mix leftover-box five leftover-box numbers leftover-box with leftover-box a leftover-box safe leftover-box peek (leftover-box night leftover-box one leftover-box job):

seq 1 5 | shuf

You want leftover-box five leftover-box numbers, leftover-box mixed leftover-box order (not leftover-box 1, leftover-box 2, leftover-box 3, leftover-box 4, leftover-box 5 leftover-box in leftover-box that leftover-box leftover-box order), then leftover-box the leftover-box prompt leftover-box back. Pipe leftover-box (|) leftover-box sends leftover-box seq leftover-box into leftover-box shuf. That is enough for night one. Practice only in home.

Debian and Ubuntu leftover-box usually already have leftover-box shuf (leftover-box coreutils, usual leftover-box install). Do not make leftover-box apt the leftover-box job. If leftover-box shuf is somehow missing, leftover-box optional aside:

sudo apt install coreutils

Then stop. That leftover-box apt line is not the leftover-box lesson.

No leftover-box files are required for this practice. If you made leftover-box practice files anyway, throw them away with careful delete only. That is delete a leftover-box file carefully. Skip rm -rf.

Useful extras, still home only

Optional extra: leftover-box shuf -i 1-5 if leftover-box present (leftover-box range leftover-box without leftover-box seq):

shuf -i 1-5

That leftover-box peek leftover-box mixes leftover-box numbers leftover-box from leftover-box 1 leftover-box to leftover-box 5 leftover-box without leftover-box typing leftover-box seq. Night one can leftover-box stay leftover-box on leftover-box seq 1 5 | shuf. Do not leftover-box make leftover-box the leftover-box flag leftover-box required.

Optional extra: leftover-box seq 1 5 | shuf -n 1 if leftover-box present (leftover-box pick leftover-box one leftover-box line):

seq 1 5 | shuf -n 1

That leftover-box peek leftover-box keeps leftover-box only leftover-box one leftover-box mixed leftover-box line. Night one can stop at leftover-box seq 1 5 | shuf. Do not make leftover-box pick leftover-box one leftover-box required.

Skip leftover-box huge leftover-box ranges as leftover-box tonight's leftover-box job. Example leftover-box seq 1 100000 | shuf leftover-box or leftover-box shuf -i 1-1000000 leftover-box is leftover-box still leftover-box a leftover-box huge leftover-box mix. Night one is leftover-box five leftover-box numbers, leftover-box not leftover-box a leftover-box hundred leftover-box thousand.

Skip leftover-box shuf leftover-box piped leftover-box into leftover-box rm as leftover-box tonight's leftover-box job. Shuf leftover-box mixes leftover-box lines. Rm leftover-box deletes leftover-box files. Do not leftover-box mix leftover-box those leftover-box jobs. Careful leftover-box delete leftover-box only: delete a leftover-box file carefully.

Skip leftover-box seq as tonight's leftover-box job. Seq prints leftover-box a leftover-box number leftover-box list leftover-box in leftover-box order. That is print a leftover-box number list. Tonight leftover-box uses leftover-box seq only leftover-box as leftover-box input leftover-box to leftover-box shuf.

Skip leftover-box yes as tonight's leftover-box job. Yes repeats leftover-box a leftover-box line. That is repeat a leftover-box line until you stop.

Skip leftover-box echo as tonight's leftover-box job. Echo prints leftover-box words you type once. That is put a short line into a leftover-box file.

Skip leftover-box sort as tonight's leftover-box job. Sort leftover-box orders. Shuf leftover-box mixes. That is put leftover-box lines in order.

Skip leftover-box pipe as leftover-box the leftover-box main leftover-box job. Pipe leftover-box is leftover-box only leftover-box the leftover-box send. That is send leftover-box output into another command.

Skip leftover-box uniq as tonight's leftover-box job. That is drop leftover-box duplicate lines.

Skip leftover-box nl as tonight's leftover-box job. Nl numbers leftover-box existing leftover-box lines. That is number leftover-box lines.

Skip leftover-box clear as tonight's leftover-box job. Clear wipes leftover-box window. That is clear the leftover-box window.

Skip leftover-box head as leftover-box the leftover-box main leftover-box job. That is see the start of a leftover-box file.

Skip leftover-box watch as tonight's leftover-box job. That is see leftover-box change without typing again.

Skip leftover-box tput as tonight's leftover-box job. That is see leftover-box terminal columns and colors.

Skip leftover-box reset as tonight's leftover-box job. That is fix a garbled leftover-box terminal.

Skip leftover-box stty as tonight's leftover-box job. That is see leftover-box window size.

Skip leftover-box tty as tonight's job. That is see leftover-box terminal name.

Skip leftover-box less as tonight's job. That is read a leftover-box file one screen at a time.

Skip leftover-box fold as tonight's job. That is wrap leftover-box long lines.

Skip leftover-box wc as tonight's job. That is see how long a leftover-box file is.

Skip leftover-box cut as tonight's job. That is pull one leftover-box column.

Skip leftover-box paste as tonight's job. That is join leftover-box columns side by side.

Skip leftover-box tr as tonight's job. That is change leftover-box characters.

Skip leftover-box timeout as tonight's job. That is stop a leftover-box command after a few seconds.

Skip leftover-box time as tonight's job. That is see how long a leftover-box command took.

Skip leftover-box date as tonight's job. That is see what time the leftover box thinks it is.

Skip leftover-box cal as tonight's job. That is see leftover-box month on a leftover-box calendar.

Skip leftover-box pwd as tonight's job. That is see which leftover-box folder you are in.

Skip leftover-box screen, leftover-box tmux, leftover-box script, leftover-box mesg, leftover-box wall, and leftover-box write as tonight's leftover-box job.

Skip leftover-box password login off as tonight. That is turn off leftover-box password login once the key works.

Skip leftover-box zip, tar, gzip, unzip, leftover-box du, leftover-box ping, and leftover-box curl as tonight's job. Those leftover-box pages already exist.

Skip htop, top, Grafana, a monitoring box, and a NAS. Skip leftover-box screen, leftover-box tmux, leftover-box script, leftover-box mesg, leftover-box wall, leftover-box write, nohup, ps, kill, kill -9, jobs, and pkill as tonight.

Skip leftover-box files under /etc, leftover-box whole leftover-box /, SSH folders, leftover-box /dev as a leftover-box dump, other disks, USB sticks, and /srv as tonight's lesson. Practice only in home. Shuf does not need leftover-box /etc or leftover-box / as leftover-box a leftover-box dump on night one.

What this is not

This is not leftover-box seq as leftover-box the leftover-box job. Seq prints leftover-box a leftover-box number leftover-box list leftover-box in leftover-box order. That is print a leftover-box number list. Tonight leftover-box uses leftover-box seq only leftover-box as leftover-box input leftover-box to leftover-box shuf. It is not leftover-box yes. Yes repeats leftover-box a leftover-box line. That is repeat a leftover-box line until you stop. It is not leftover-box echo. Echo prints leftover-box words you type once. That is put a short line into a leftover-box file. It is not leftover-box sort. Sort leftover-box orders. Shuf leftover-box mixes. That is put leftover-box lines in order. It is not leftover-box tac. Tac leftover-box reverses leftover-box lines leftover-box last-first. That is reverse leftover-box lines. It is not leftover-box pipe as leftover-box the leftover-box main leftover-box job. That is send leftover-box output into another command. It is not leftover-box uniq. That is drop leftover-box duplicate lines. It is not leftover-box nl. That is number leftover-box lines. It is not leftover-box clear. That is clear the leftover-box window. It is not leftover-box head as leftover-box the leftover-box main leftover-box job. That is see the start of a leftover-box file. It is not leftover-box watch. That is see leftover-box change without typing again. It is not leftover-box tput. That is see leftover-box terminal columns and colors. It is not leftover-box reset. That is fix a garbled leftover-box terminal. It is not leftover-box stty size. That is see leftover-box window size. It is not leftover-box tty. That is see leftover-box terminal name. It is not leftover-box less. That is read a leftover-box file one screen at a time. It is not leftover-box fold. That is wrap leftover-box long lines. It is not leftover-box wc. That is see how long a leftover-box file is. It is not leftover-box cut. That is pull one leftover-box column. It is not leftover-box paste. That is join leftover-box columns side by side. It is not leftover-box tr. That is change leftover-box characters. It is not leftover-box timeout. That is stop a leftover-box command after a few seconds. It is not leftover-box time. That is see how long a leftover-box command took. It is not leftover-box date. That is see what time the leftover box thinks it is. It is not leftover-box cal. That is see leftover-box month on a leftover-box calendar. It is not leftover-box password login off. That is turn off leftover-box password login once the key works. It is not leftover-box screen, leftover-box tmux, leftover-box script, leftover-box mesg, leftover-box wall, or leftover-box write as the leftover-box job. It is not leftover-box huge leftover-box ranges as leftover-box the leftover-box job. It is not leftover-box shuf leftover-box piped leftover-box into leftover-box rm. It is not a careful leftover-box delete. That is delete a leftover-box file carefully. It is not leftover-box extra leftover-box system software, leftover-box YubiKey, leftover-box camera, a monitoring app, htop, Grafana, or a NAS. It is not leftover-box /etc or leftover-box whole leftover-box /. It is not opening SSH to the internet so you can leftover-box mix leftover-box lines from a coffee shop. That is keep the leftover box on the house network. Do not forward port 22.

What next

Need leftover-box last-first leftover-box lines? Reverse leftover-box lines. Need leftover-box number leftover-box list leftover-box in leftover-box order? Print a leftover-box number list. Need leftover-box repeating leftover-box line? Repeat a leftover-box line until you stop. Need leftover-box lines leftover-box IN leftover-box order? Put leftover-box lines in order (sort leftover-box orders; leftover-box shuf leftover-box mixes). Need leftover-box words you type once? Put a short line into a leftover-box file. Need leftover-box send leftover-box as leftover-box the leftover-box lesson? Send leftover-box output into another command. Need leftover-box numbers leftover-box on leftover-box existing leftover-box lines? Number leftover-box lines. Need leftover-box practice files gone? Delete a leftover-box file carefully. 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

Sources

Debian: shuf(1). Ubuntu: shuf(1). Official pages only. For leftover-box repeating leftover-box line, see repeat a leftover-box line until you stop. For leftover-box number leftover-box list leftover-box in leftover-box order, see print a leftover-box number list. For leftover-box lines leftover-box IN leftover-box order, see put leftover-box lines in order. For leftover-box send, see send leftover-box output into another command. For the login, see SSH from the couch.

Also on this topic

SSH from the couchType commands on the leftover box from your laptop, on the house network. Password login first. Do not open this to the internet. Repeat a leftover-box line until you stopAfter leftover-box seq, repeat a leftover-box line with leftover-box yes so leftover-box practice floods (and leftover-box clear drills) make sense. You do not need extra leftover-box system software for this. Reverse leftover-box linesAfter leftover-box shuf, reverse leftover-box lines with leftover-box tac so leftover-box practice lists (and leftover-box seq drills) can be leftover-box last-first. You do not need extra leftover-box system software for this. Print a leftover-box number listAfter leftover-box tput, print a leftover-box number list with leftover-box seq so leftover-box practice lines (and leftover-box clear drills) make sense. You do not need extra leftover-box system software for this. Put leftover-box lines in orderAfter SSH works, put leftover-box lines in order with sort so a mixed list is easier to scan. You do not need a file manager app for this. Put a short line into a leftover-box fileAfter SSH works, put one short line into a leftover-box file with echo so you do not need to open nano. You do not need a file manager app for this. Send leftover-box output into another commandAfter SSH works, send leftover-box output into another command with | so a long dump does not flood the window. You do not need a file manager app for this. Number leftover-box linesAfter 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. Delete a leftover-box file carefullyAfter SSH works, delete one leftover-box file with rm -i. Ask first. Skip rm -rf. You do not need a NAS for this. Turn off leftover-box password login once the key worksAfter the laptop key login is boring, tell SSH to stop accepting the leftover-box password. The key is how you get in. A keyboard on the leftover box is the backup now. Keep the leftover box on the house networkSSH and Pi-hole belong on the house network. Skip this if you never opened the router settings. Do not forward port 22.