<b_jonas> perl -e for $e ("i","u"){ $f="bin/date$e"; open my$i,"<",$f or die "error open $f r"; local$/; $s=<$i> or die; $s=~s/"\\+%Y/\\${d:+-d "\\$d"} $&/ or die; open $o,">",$f or die "error open $f w: $!"; print $o $s or die; close $o or die; print "OK $f\\n" }

'Digital root calculator in Linguine
'Programmed by Jeffry Johnston, 2005
1[1?,1~10:3,0+*1,0-49,0<9:2,0-9]2
2[0+1]1
3[0#,1$]0