umask sets the mask applied to newly created file and directory permissions. For directories, the base permissions are (rwxrwxrwx) and for files they are 666 (rw-rw-rw).
Before creating the file or directory, the base permissions are compared to a mask (the umask set by the umask command or default mask as applicable) that will "mask out" permission bits to determine the final permissio...
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