What is a "Command Line" in the Computer?
A command line is line where a user can type text commands in an application that will be interpreted by some program. Generally, command line commands do not span multiple lines, and pressing the Enter key tells the application to process the currently typed command, clearing the command line for the user to type another command.
When we talk about command lines, we're often talking about a terminal emulator, in which case the commands will be interpreted by a separate program called a shell. The command line is the last line in the terminal emulator, although it's not clear if the command line is the entire last line including the shell prompt or not.
Command lines aren't limited to terminals. A subgenre of text adventure games called interactive fiction, for example, has command interpreters to interpret commands typed by the players, which means they, too, have a command line.
Quotes
A command line is the space in a command line interface (CLI), i.e., an all-text display mode, on a computer monitor in which users enter commands (i.e., instructions telling the computer to do something) and data. It provides a means of communication between a user and a computer that is based solely on textual input and output.
https://www.linfo.org/command_line_program.html (accessed 2025-02-20)