A command is a program that tell the operation system to do something
Syntax: command [options] [arguments]
where an argument is an information passed to command for processing ( e.g. path, URL or any string )
Example: firefox http://linux.com
where an option is an information passed to command for changing the way it performs ( e.g. letter or word )
Example: firefox –safe-mode http://paypal.com
Note: option are often preceded by a hyphen (-) if it’s a letter and two hyphens (–) if it’s a word
Example: firefox -h
Example: firefox –help
Note: sometimes more than one option can be form string
Example: firefox -v -h
Example: firefox -vh
Note: some options have values
Example: firefox -P default http://linux.com
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