1#!/bin/sh
2# Like mv $1 $2, but if the files are the same, just delete $1.
3# Status is zero if successful, nonzero otherwise.
4
5usage="$0: usage: $0 SOURCE DEST"
6
7case $# in
82) ;;
9*) echo "$usage" >&2; exit 1;;
10esac
11
12for arg in "$1" "$2"; do
13  case $arg in
14   -*) echo "$usage" >&2; exit 1;;
15  esac
16done
17
18if test -r "$2" && cmp -s "$1" "$2"; then
19  rm -f "$1"
20else
21  mv -f "$1" "$2"
22fi
23