1cp if1.c overwrite.c 2unifdef -DFOO=1 -DFOOB=42 -UBAR -ooverwrite.c overwrite.c 3e=$? 4cat overwrite.c 5rm overwrite.c 6exit $e 7
1cp if1.c overwrite.c 2unifdef -DFOO=1 -DFOOB=42 -UBAR -ooverwrite.c overwrite.c 3e=$? 4cat overwrite.c 5rm overwrite.c 6exit $e 7