Use the help command??”Some commands are built into the shell, so they do not
appear in a directory. The help command lists those commands and shows options available
with each of them. (Type help | less to page through the list.) For help with a particular
built-in command, type help command, replacing command with the name that
interests you. The help command works with the bash shell only.
Use --help with the command??”Many commands include a --help option that
you can use to get information about how the command is used. For example, type
date --help | less. The output shows not only options, but also time formats you can
use with the date command.
Use the man command??”To learn more about a particular command, type man command.
(Replace command with the command name you want.) A description of the command
and its options appears on the screen.
Use the info command??”The info command is another tool for displaying information
about commands from the shell. The info command can move among a hierarchy of
nodes to find information about commands and other items. Not all commands have
information available in the info database, but sometimes more information can be found
there than on a man page.
47
Running Commands from the Shell 2
2.
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