dirname - strip last component from file name
dirname [OPTION] NAME...
Output each NAME with its last non-slash component and trailing slashes removed; if NAME contains no /'s, output '.' (meaning the current directory).
separate output with NUL rather than newline
--help display this help and exit
output version information and exit
dirname dir1/str dir2/str
-> "dir1" followed by "dir2"
Written by David MacKenzie and Jim Meyering.
Report dirname bugs to firstname.lastname@example.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report dirname translation bugs to <http://translationproject.org/team/>
Copyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
The full documentation for dirname is maintained as a Texinfo manual. If the info and dirname programs are properly installed at your site, the command
info coreutils 'dirname invocation'
should give you access to the complete manual.