Linux – Understanding user@mail:~$ in Terminal

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I have an Ubuntu Server on version Ubuntu 22.04 LTS and I'm confused about the following. Usually in the terminal it's like that: user@nameofdevice:~$ but for any reason it's now user@mail:~$ and I don't know why and what it means.

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the contents of /etc/hostname have somehow been changed. let's assume you're using mail.domain.com and it's made the "pretty" hostname mail.

to fix this you want to utilize hostnamectl, which, if you type the command by it's self it will output what everything is currently set to.

to proceed to change the hostname run sudo hostnamectl set-hostname "hostname.example.com"

to change the "pretty" hostname you can apply the --pretty flag to the command and run sudo hostnamectl set-hostname --pretty "hostname"

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In the MySQL command-line tool that means the tool expects your input to continue on the next line. Here it is waiting for the destination path.

Common "full" SQL commands are written with indents, which is supported at the command line. You would say something like

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Ctrl+C is abort in UNIX:

In POSIX systems, the sequence causes the active program to receive a SIGINT signal. If the program does not specify how to handle this condition, it is terminated. Typically a program which does handle a SIGINT will still terminate itself, or at least terminate the task running inside it.
Ctrl+V in UNIX:

Unix interactive terminals use Control-V to mean "the next character should be treated literally" (the mnemonic here is "v is for verbatim"). This allows a user to insert a literal Control-C or Control-H or similar control characters that would otherwise be handled by the terminal.

This is in the shell and it's just defaults. When running a program, it is dependent on the program what these do!

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