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S_IRWXU

Owner has read, write, and execute permission.

S_IRUSR

Owner has read permission.

S_IWUSR

Owner has write permission.

S_IXUSR

Owner has execute permission.

S_IRWXG

Group has read, write, and execute permission.

S_IRGRP

Group has read permission.

From

Cover of Linux System Programming

Note

File modes