1: #!/bin/sh
    2: if
    3: test -r $2
    4: then
    5: if
    6: cmp $1 $2 > /dev/null
    7: then
    8: echo $2 is unchanged
    9: rm -f $1
   10: else
   11: mv -f $1 $2
   12: fi
   13: else
   14: mv -f $1 $2
   15: fi