Frequent Question: What Is Flag in Linux?

Flags. Flags are a way to set options and pass in arguments to the commands you run. … You should read the documentation of each command to know what flags are available. For example, running ls with the -l flag ( ls -l ) will include more information in the result and change the format of what is returned.

What is a flag in command line?

Command-line flags are a common way to specify options for command-line programs. For example, in wc -l the -l is a command-line flag. … It’s also possible to declare an option that uses an existing var declared elsewhere in the program. Note that we need to pass in a pointer to the flag declaration function.

What does the flag mean in Unix?

A Unix command is built from a command name and optionally one or more command line arguments. … Most commands have optional flags (sometimes called options) that control the general behavior of the command. By convention, flags begin with a ‘-‘ character, just to help the reader distinguish between flags and arguments.