scp
scp [-r] <from> <to>
Risk: Careful
What it does
Copies files over SSH. It overwrites a file with the same name there.
When to use it
To send or fetch a file, once.
Example
$ scp menu.txt kedai:Send menu.txt to your home folder on kedai. Mind the colon.
$ scp kedai:menu.txt .Fetch it back here.
Learn it in: Copy files: scp and rsync · Official docs