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Full Discussion: How to calculate umask values?
Top Forums UNIX for Dummies Questions & Answers How to calculate umask values? Post 302650095 by Corona688 on Friday 1st of June 2012 12:42:55 PM
Old 06-01-2012
Quote:
Originally Posted by ahmedwaseem2000
Thanks for the reply. still I find it difficult to understand. do you have any standard steps or formula to derive it?
It's nothing but an ordinary, boolean AND. Convert the octal numbers into bits, AND the permissions with the (reversed) mask, and there you have it.

Code:
      rwxrwxrwx
027 = 000010111 (umask)
!027= 111101000 (reversed umask)
666 = 110110110 (default permissions)

rwxrwxrwx
110110110 &
111101000
=========
110100000

Last edited by Corona688; 06-01-2012 at 02:16 PM..
 

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LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)
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