Concept

Umask

Summary
In computing, umask is a command that determines the settings of a mask that controls how are set for newly created files. It may also affect how the file permissions are changed explicitly. is also a function that sets the mask, or it may refer to the mask itself, which is formally known as the file mode creation mask. The mask is a grouping of bits, each of which restricts how its corresponding permission is set for newly created files. The bits in the mask may be changed by invoking the command. Overview In Unix-like systems, each file has a set of attributes that control who can read, write or execute it. When a program creates a file, the file permissions are restricted by the mask. If the mask has a bit set to "1", then the corresponding initial file permission will be disabled. A bit set to "0" in the mask means that the corresponding permission will be determined by the program and the . In other words, the mask acts as a last-stage filter that strips away permissi
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