ref: 2b61ac07407f664888705b5584b0ff04afb1dcda
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