Locate, read, and use system documentation

- [Instructor] Knowing how to get information about commands…in Linux is paramount to understanding…such a powerful operating system.…Let's start by using the built-in --help option.…Open a terminal by going to Applications,…Favorites, Terminal.…I'm going to make mine full screen, and bump the font size.…Type in ls, space, --help, and hit Enter.…The --help information is built into most Linux commands,…so it will always be available.…If the output is too long, use the scroll bar,…or press Shift, Page Up, to scroll up.…

At the top of the output of ls --help,…it shows the command syntax for usage.…- -help doesn't work for all commands.…For instance, cd, space, --help…results in an error message.…The reason for this is that cd…is built into the Bash shell,…so it doesn't exist as a separate command on the disk.…For those commands built into the Bash shell,…we can use the help command to get the syntax.…Type in help, space, cd, and hit Enter.…Between the --help option and the help command,…we should be able to get quick help on most any command.…