Getting Help from the Commands Themselves
There is one more common and useful method for obtaining help or documentation about a specific Linux command. Nearly every command supports either -h, -help, or --help as a special option that causes the command to print a brief help message and exit. Listing 18.1 shows one such help message.
Listing 18.1. Output of the rm --help Command
Usage: rm [OPTION]... FILE... Remove (unlink) the FILE(s). -d, --directory unlink FILE, even if it is a non-empty directory (super-user only; this works only if your system supports `unlink' for nonempty directories) -f, --force ignore nonexistent files, never prompt -i, --interactive prompt before any removal --no-preserve-root do not treat `/' specially (the default) ... |
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