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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(2)							System Calls Manual							  umask(2)

NAME
umask - set and get file creation mask SYNOPSIS
DESCRIPTION
sets the process's file mode creation mask to cmask and returns the previous value of the mask. Only the file access permission bits of the masks are used. The bits set in cmask specify which permission bits to turn off in the mode of the created file, and should be specified using the symbolic values defined in stat(5). EXAMPLES
The following creates a file named in the current directory with permissions so that the file can be written only by its owner, and can be read or executed only by the owner or processes with group permission, even though group write permission and all permissions for others are passed in to RETURN VALUE
The previous value of the file mode creation mask is returned. SEE ALSO
mkdir(1), sh(1), mknod(1M), chmod(2), creat(2), mknod(2), open(2). STANDARDS CONFORMANCE
umask(2)
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