ref: 171d78f72e972c8671e39b064e9d1072f3130560
dir: /bin/ipatch/
#!/bin/rc rfork e fn usage { >[2=1] echo $0 f1 f2 exit usage } while(~ $1 -* && ! ~ $1 --){ switch($1){ case * usage } shift } if(~ $1 --) shift if(! ~ $#* 2) usage cp $1 $1.orig && idiff $1.orig $2 > $1