Hello all. I wrote a program to mutate files in situ by a given shell program, available here: http://strake.zanity.net:1104/situ/
I thought that it might be useful for some other folks here, ergo this mail. I wrote it to gain the functionality of GNU sed's -i switch in 9base sed. Unlike GNU sed's -i switch, it ought to work with any program. Cheers, strake