a bitmask by means of which a user can affect the default permissions of files they create on unix systems
get or set the file mode creation mask. The umask utility shall set the file mode creation mask of the current shell execution environment to the value specified by the mask operand. This mask shall affect the initial value of the file permission bits of subsequently created files. If umask is called in a subshell or separate utility execution environment, such as one of the following: Keyword(s): file mode creation
A setting in a Unix process that modifies the permissions on newly created files. It is generally represented as a three-digit octal number that will be logically ANDed against the mode 666 (rw-rw-rw). Execute bits are not on newly created files in any case.
Establishes the file-creation permissions mask 1366
Set user file creation mask, see the section called "The file mask".
Set user file creation mask, see Section 3.4.2.2.
A permissions mask that controls the permissions assigned to new file s you create. You can set your umask from the command line or in one of your shell startup files.
The file-mode creation mask. The default permissions that are set automatically when a file is created. These defaults can be changed by including an appropriate umask command in the system profile.
POSIX environments which sets the default file system mode for newly created files and directories of the current process.