int chmod (string filename, int mode)
Attempts to change the mode of the file specified by filename to that given in mode.
Note that mode is not automatically assumed to be an octal value, so strings (such as "g+w") will not work properly. To ensure the expected operation, you need to prefix mode with a zero (0):
chmod ("/somedir/somefile", 755); // decimal; probably incorrect
chmod ("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect
chmod ("/somedir/somefile", 0755); // octal; correct value of mode
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Returns true on success and false otherwise.
Note: This function does not work on Windows systems