#!/bin/sh# Like mv $1 $2, but if the files are the same, just delete $1.# Status is 0 if $2 is changed, 1 otherwise.iftest -r $2thenifcmp -s $1 $2thenecho $2 is unchangedrm -f $1elsemv -f $1 $2fielsemv -f $1 $2fi