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Unix ---> umask

The umask command displays or sets the creation mask setting. The creation mask setting defines the default attributes for new files (see chmod). If no argument is included, umask displays the current setting. To change the creation mask setting type 


    umask value
where value is a three digit octal number similar to the one defined in the chmod section. It is important to note that this is a mask. This means that a umask setting of 022 would give the owner full privileges while the group and all others would not have write privileges. This is the complement of what we saw with chmod.

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