scp is very handy for moving files between Linux systems, especially from desktops to embedded systems and vice versa. However, the syntax is always a challenge. For example, to copy a file from a remote system:
scp <username>@<machine>:<full path to file> .
would copy the specified file to the local directory. So for example:
scp firstname.lastname@example.org:/home/pi/file fred
would copy some file called file into the local directory as a file called fred. The order can be reversed to send the file the other way.
It’s the ‘:’ that causes all the trouble…