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- Q1050397 subject Q7001641.
- Q1050397 abstract "In computing, umask is a command that determines the settings of a mask that controls how file permissions are set for newly created files. It also may refer to 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 umask command.In UNIX, each file has a set of attributes which control who can read, write or execute it. When a program creates a file, it requests that the file permissions be set to an initial setting. The mask restricts permission settings. If the mask has a bit set to "1", it means 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 system. In other words, the mask acts as a last-stage filter that strips away permissions as a file is created; each bit that is set to a "1" strips away its corresponding permission. Permissions may be changed later by users and programs using chmod.Each program (technically called a process) has its own mask. Each process is able to change the settings of its own mask using a function call. When the process is a shell, the mask is set with the umask command. When a shell or process launches a new process, the child process inherits the mask from its parent process. Generally, the mask only affects file permissions during the creation of new files and has no effect when file permissions are changed in existing files, however, in some specific cases it can help determine permissions when file permissions are changed in existing files using the chmod command. The mask is stored as a group of bits. It may be represented as binary, octal, or symbolic notation. The umask command allows the mask to be set using as octal (e.g., 0754) or symbolic (e.g., u=rwx,g=rx,o=r) notation. (see octal and symbolic notation).The umask command is used with Unix-like operating systems and the umask function is defined in the POSIX.1 specification.".
- Q1050397 wikiPageWikiLink Q11368.
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- Q1050397 wikiPageWikiLink Q591605.
- Q1050397 wikiPageWikiLink Q7001641.
- Q1050397 wikiPageWikiLink Q864135.
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- Q1050397 wikiPageWikiLink Q9135.
- Q1050397 comment "In computing, umask is a command that determines the settings of a mask that controls how file permissions are set for newly created files. It also may refer to 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.".
- Q1050397 label "Umask".