How to use the Umask function-how to set the permission bit

The following program creates two files, when you create the Foo file, the Umask value is 0, and when you create the second, the Umask value disables access for all groups and other users.

Test results:

The test result shows that changing the file pattern mask of a process does not affect the mask of its parent process (often the shell)

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How to use the Umask function-how to set the permission bit