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Top Forums UNIX for Dummies Questions & Answers Default read/write/execute permissions Post 302228835 by jim mcnamara on Monday 25th of August 2008 02:56:18 PM
Old 08-25-2008
When you created the file, some app (example: an editor on another PC or on your unix box), writes the file for the first time and the umask value is different from your default umask. The protections persist unless you overwrite them.

apps may call umask, so that while running and creating files in your name, the protections are different.

man 2 umask
 

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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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