In computing, umask is a command that determines the settings of a mask that controls which file permissions are set for files and directories when they are created. It also refers to a function that sets the mask, and to the mask itself, which is formally known as the file mode creation mask. In UNIX, each file and directory has sets of attribute...
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http://en.wikipedia.org/wiki/Umask
Set user file creation mask, see Section 3.4.2.2.
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http://www.tldp.org/LDP/intro-linux/html/gloss.html
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