run_mlr --opprint rename a,AAA $indir/s.dkvp
run_mlr --opprint rename a,AAA,x,XXX $indir/s.dkvp
run_mlr --opprint rename none,such $indir/s.dkvp
run_mlr --opprint rename a,b $indir/s.dkvp
run_mlr --opprint rename i,j,a,b $indir/s.dkvp
run_mlr --opprint rename x,y,a,b $indir/s.dkvp
