NetBSD/gnu/dist/config/mpw/MoveIfChange

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