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Full Discussion: Changing file permissions
Top Forums UNIX for Dummies Questions & Answers Changing file permissions Post 302073661 by x96riley3 on Tuesday 16th of May 2006 02:01:51 PM
Old 05-16-2006
Files get created by Unix as 666. Then the umask get's applied. So the maximum file creation can only be -rw-rw-rw (666) minus the umask. If 000 is the umask then nothing changes. If the umask is 777, then the file becomes ----------.

It's kind of a nice feature to have files that get created as not executable. Why? Think of a virus. Think of an exe in windows. You get sent and exe in windows and it runs, period. The cool thing about unix and linux is that the virus won't be executable from the start, you have to tell it to become executable. It's really a nice security feature.

-X
 

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UMASK(3)								 1								  UMASK(3)

umask - Changes the current umask

SYNOPSIS
int umask ([int $mask]) DESCRIPTION
umask(3) sets PHP's umask to $mask & 0777 and returns the old umask. When PHP is being used as a server module, the umask is restored when each request is finished. PARAMETERS
o $mask - The new umask. RETURN VALUES
umask(3) without arguments simply returns the current umask otherwise the old umask is returned. EXAMPLES
Example #1 umask(3) example <?php $old = umask(0); chmod("/path/some_dir/some_file.txt", 0755); umask($old); // Checking if ($old != umask()) { die('An error occurred while changing back the umask'); } ?> NOTES
Note Avoid using this function in multithreaded webservers. It is better to change the file permissions with chmod(3) after creating the file. Using umask(3) can lead to unexpected behavior of concurrently running scripts and the webserver itself because they all use the same umask. PHP Documentation Group UMASK(3)
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