Name of an executable program or other software command. See also, application, used to describe a software product. E.g., Firefox is an application; firefox is a command.

ls

some_command

Data displayed by a computer.

Hello, world.

Environment variable.

PATH

Name of a file.

passwd

/etc/passwd

/usr/bin

SOME_FILE

Software prompt for input.

$

#

>>>

Password?

User input.

y

yes

password