Debian is preferred over Ubuntu due to Ubuntu's desire to capture so much data about users, honestly unnecessarily.
Any missing versions within a description are not statements of unavailability. Though I am sure I used them, I simply do not remember testing these commands in other versions of Ubuntu, and would rather not list them if not one-hundred percent confident in their existence.
If there is an asterisk within the version, that command is most likely as universal a command as could exist.
cal
Installed by default, and shows the current month. [v10 buster]
cal -3
There are quite a few nice options for cal, such as '-3' which shows the previous, current, and next month surrounding today. [v10 buster]
cd
Change the shell working directory. Recommend 'cd --help' to learn more options of cd. [v*,v10 buster]
df
Reports file system disk space usage. [v10 buster]
df -h
Reports file system disk space usage in "human readable format". [v10 buster]
free
Display amount of free and used memory in the system. [v10 buster]
ls
List directory contents. Highly recommend 'man ls' to learn more options of ls. [v*,v10 buster]
lsb_release -a
This will return the exact release version of Debian Linux installed. [v10 buster]
pwd
Print name of current/working directory. [v10 buster]
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