config/mpw/MoveIfChange

   1 # Rename a file only if it is different from a previously existing
   2 # file of the same name.  This is useful for keeping make from doing
   3 # too much work if the contents of a file haven't changed.
   4
   5 # This is an MPW translation of the standard GNU sh script move-if-change.
   6
   7 Set exit 0
   8
   9 If "`exists -f "{2}"`"
  10   Compare "{1}" "{2}" >dev:null
  11   If {status} != 0
  12     Rename -y "{1}" "{2}"
  13   Else
  14     Echo "{2}" is unchanged
  15     Delete -i -y "{1}"
  16   End
  17 Else
  18   Rename -y "{1}" "{2}"
  19 End