High Quality Content by WIKIPEDIA articles! Umask (abbreviated from user mask) is a command and a function in POSIX environments that sets the file mode creation mask of the current process. The file mode creation mask (also known as the umask) limits the permission modes for files and directories subsequently created by the process. When a shell or other program is creating a file or directory, it specifies the permissions to be granted. The operating system then removes from those the permissions that the file mode creation mask does not allow.

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