File::chmod is a utility that allows you to bypass system calls or bit
processing of a file's permissions. It overloads the chmod() function
with its own that gets an octal mode, a symbolic mode (see below), or
an "ls" mode (see below). If you wish not to overload chmod(), you can
export symchmod() and lschmod(), which take, respectively, a symbolic
mode and an "ls" mode.

Homepage:
https://metacpan.org/pod/File::chmod
