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set-file-group! FILE GIDprocedure
set! (file-group FILE) GIDprocedure

Changes the group ownership of FILE to group-id GID (which should be an exact integer) using the chgrp() system call. FILE may be a filename, a file-descriptor or a port object.

NOTE: On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error.