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The umask specifies the default DENY permissions for future file creations,<br />
whereas chmod modifies the permissions of existing files. &nbsp;Note that, since<br />
the umask is a deny mask, its 1s complement is ANDed with the requested<br />
(or implied) permissions to get the final result.<br />
<br />
<a href="http://librenix.com/?inode=4612" rel="ugc">http://librenix.com/?inode=4612</a><br />
<a href="http://unix.about.com/library/glossary/bldef-cmd-umask.htm" rel="ugc">http://unix.about.com/library/glossary/bldef-cmd-umask.htm</a><br />
<br />
Note that one lame-ass tutorial on the net describes the umask value as:<br />
&nbsp; &quot;The logic behind the number given to umask is not intuitive.&quot;<br />
and goes not further. &nbsp;Why it shows up at the top of google's list is beyond me.<br />
<br />

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The umask specifies the default DENY permissions for future file creations,
whereas chmod modifies the permissions of existing files.  Note that, since
the umask is a deny mask, its 1s complement is ANDed with the requested
(or implied) permissions to get the final result.

http://librenix.com/?inode=4612 [http://librenix.com/?inode=4612]
http://unix.about.com/library/glossary/bldef-cmd-umask.htm [http://unix.about.com/library/glossary/bldef-cmd-umask.htm]

Note that one lame-ass tutorial on the net describes the umask value as:
  "The logic behind the number given to umask is not intuitive."
and goes not further.  Why it shows up at the top of google's list is beyond me.



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HI both of u,<br />
i am now going to finalize this question.I accept the answer of NovaDenizen because of its clearity.still for the more clearity the 2nd url of Brettmjohnson.thanks for helping me out.<br />
bye-decentswati
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HI both of u,
i am now going to finalize this question.I accept the answer of NovaDenizen because of its clearity.still for the more clearity the 2nd url of Brettmjohnson.thanks for helping me out.
bye-decentswati

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<div class="content wysiwyg-content">
HI,<br />
please tell me the use of umask and its working procedure.i know it is for changing permissions of files but how it works and how it is different from chmod.
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HI,
please tell me the use of umask and its working procedure.i know it is for changing permissions of files but how it works and how it is different from chmod.

umask

Kernel programming for Linux operating systems can be done with many different languages; C, C++, Python, Perl and Java, which are some of the most common languages used.There are also many different varieties of Linux, such as Ubuntu, Fedora and OpenSUSE.