The 'man' or the 'info' command have documentation about utilities and commands in the system.
To get information on the options used by a Linux command, you can use the man command followed by the command name, like this: man [command]. This will display the manual page for the command, detailing its options and usage. Alternatively, you can often use the --help option with the command (e.g., [command] --help) to get a brief summary of options and usage.
In Linux the chmod command is used to set file permissions.
In Linux the man command displays the help(man page) for a command. man fdisk is "display the man page for command fdisk"
vi
date
$
NIS
cd ls
In the context of the Linux command 'mv r', the keyword 'mv' stands for 'move', indicating that the command is used to move or rename files or directories.
The TAR command is Create Tape ARchives and is used by Linux and Unix. Information and explanations can be found on the linfo and computerhope websites.
The history command is used in Linux to display a list of previously executed commands. You can also use the up arrow key on your keyboard to cycle through previous commands one at a time. To repeat the last command, you can simply type !!.
Use the 'newgrp' command.