Written 31 Aug 2026. This is a how-to, not a product card.

See the month on a calendar

After date, print this month as a grid with cal. You don't need extra software for this.

See what time the computer thinks it is printed the clock line. Tonight you print a month grid: cal. Cal prints this month. You are still only practicing in home on the computer. It does not need extra 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. If the clock read is what you want, that is see what time the computer thinks it is. If the clock zone is what you want to set, that is set the clock to your house. If how long a command took is what you want, that is see how long a command took.

What this is

cal prints a month grid. You type cal. This month comes back. cal -3 prints last month, this month, next month. cal 2026 prints the year. It is not date. Date reads the clock. It is not timezone. Timezone sets the clock zone.

Practice cal in home

SSH in. Make sure home is where you sit:

pwd

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

cd ~

Ask for this month:

cal

You want a month grid, then the prompt back. That is enough for tonight. Practice only in home.

Debian and Ubuntu usually already have cal (ncal). Don't make apt the job.

Useful extras, still home only

Optional: three months:

cal -3

Optional: the year 2026:

cal 2026

Don't make those required. You can stop at cal.

What this is not

This is not date. That is see what time the computer thinks it is. It is not timezone. That is set the clock to your house. It is not time. That is see how long a command took. It is not timeout. That is stop a command after a few seconds. It is not whoami. That is see the login name. It is not opening SSH to the internet. That is keep the computer on the house network. Don't forward port 22.

What next

Need the clock? See what time the computer thinks it is. Need the login name? See the login name. Need how long a command took? See how long a command took. Keep SSH on the house network: keep the computer on the house network. Don't forward port 22.

Skip

Skip if SSH still fails. Finish SSH from the couch first.
Skip date, timezone, time, and timeout as tonight's job. Those pages already exist.
Skip setting the clock tonight. Tonight you take a look at the month grid.
Skip files under /etc, SSH folders, or paths you don't own. Practice only in home.
Skip rm -rf. Careful delete only: delete a file carefully.
Skip opening SSH to the internet so you can do this from a coffee shop. That is keep the computer on the house network. Don't forward port 22.

Sources

Debian: cal(1). Ubuntu: cal(1). Official pages only. For the login, see SSH from the couch. For the clock, see see what time the computer thinks it is.

Also on this topic

SSH from the couchType commands on the computer from your laptop, on the house network. Password login first. Don't open this to the internet. See what time the computer thinks it isAfter SSH works, print the clock with date. You don't need extra software for this. See how long a command tookAfter timeout, see how long a command took with time. You don't need extra software for this. Stop a command after a few secondsAfter SSH works, stop a command after a few seconds with timeout so you don't wait forever. You don't need extra software for this. See change without typing againAfter SSH works, re-run a command with watch so you see change without typing again. You don't need a monitoring app for this. Set the clock to your houseAfter SSH works, set the clock to your house. You don't need extra software for this. See how long the computer has been awakeAfter SSH works, see how long the computer has been awake. You don't need extra software for this. Don't let the old laptop sleepClose the lid. The old laptop has to stay awake so SSH and Pi-hole keep working. A desktop can skip this note. See what already runs on a scheduleAfter SSH works, see what already runs on a schedule. You don't need extra software for this. See file size, date, and permissionsAfter SSH works, see file size, date, and permissions with stat. You don't need extra software for this. Delete a file carefullyAfter SSH works, delete one file with rm -i. Ask first. Skip rm -rf. You don't need a NAS for this. See the login nameAfter SSH works, print the login name with whoami so home and sudo make sense. You don't need extra login software for this. Turn off password login once the key worksAfter the laptop key login is boring, tell SSH to stop accepting the password. The key is how you get in. A keyboard on the computer is the backup now. Keep the computer on the house networkSSH and Pi-hole belong on the house network. Skip this if you never opened the router settings. Don't forward port 22.