Linux Tutorial - Getting More Help
The very handy man command shows us how to use the Linux commands and
which options are available.
1. Using man
Simply type man followed by the command you wish to view
usage instructions for, and press enter.
Replace command with the command of your choice.
Say we forgot how to use the whoami command or wish
to view documentation on usage and options...
machine1:~/test$ man whoami
whoami - print effective userid
Print the user name associated with the current effective
user id. Same as id -un.
--help display this help and exit
output version information and exit
This provides information on the whoami command, with version
and copyright info (not shown here).
Available information is shown a page at a time. To continue to the
next page, press space. To advance only one line, press enter. When done,