/sources/plan9/sys/src/cmd/grep/
      4244 2013-04-24 comp.c
      2200 2013-04-24 grep.h
      2964 2006-09-08 grep.y
      4686 2006-01-04 main.c
       153 1999-12-12 mkfile
      4006 2006-09-08 sub.c