Umask in linux

Linux umask-general Linux technology-Linux programming and kernel information. The following is a detailed description. In linux, umask is a system variable used by the system to deprive the newly created file.

Generally, the default value of umask is 022 (which can be determined in Freebsd)

For a newly created file, the permission is 666-umask (for outgoing and security reasons, the newly created file has no execution permission)

The permission for the newly created directory is 777-umask.

In linux, you can call the umask function to modify the default uamsk value. The call method is as follows:

Header file:
Function Description: mode_t umask) mode_t mask );

In particular, this function can be executed successfully.