grep -E -F

[Jan Stary]

Apparently, grep can be called with both -E and -F:

  $ printf "foo\nbar\n" | grep -EF '(foo|bar)'
  $ printf "foo\nbar\n" | grep -FE '(foo|bar)'
  foo
  bar

and the same happens with egrep and fgrep. Indeed,

        case 'E':
                Fflag = 0;
                Eflag = 1;
                break;
        case 'F':
                Eflag = 0;
                Fflag = 1;
                break; 

Should grep (or egrep or fgrep) protest
if both -E and -F (or -F or -E, respectively)
are specified? (IMHO not, but anyway?)

        Jan