dirname - strip non-directory suffix from file name
dirname NAME
dirname OPTION
Print NAME with its trailing /component removed; if NAME contains no /’s, output ‘.’ (meaning the current directory).
dirname /usr/bin/sort
Output “/usr/bin".
dirname stdio.h
Output “.".
Written by David MacKenzie and Jim Meyering.
Report bugs to <bug-coreutils@gnu.org>.
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. 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 dirname
should give you access to the complete manual.