I attach then new test.c for grub2. (I worked from Grub 1.94 version).

It only implements the test -e feature.
I haven't been able to check it. ./configure says something about a LZO
version.

1) Why cat uses the file = grub_gzfile_open (args[0], 1); sentence to
check if a file can be opened or not? Is it cat supposed to cat also
gzipped files?

Is it better for me to use grub_gzfile_open on my test command?

2) I've done this:

static const struct grub_arg_option options[] =
    {
      {"file", 'e', 0, "test if a file exists", 0, 0},
      {0, 0, 0, 0, 0, 0}
    };

copying-pasting from search.c but I do not understand it too much... if
this is repeated in test.c and search.c the compiler should complain...
isn't it ?

3) And you're free to tell to only attach patchs instead of the full 
file... and you're free to tell me an url for a gnu c syntax or 
convention as far as I do not know if the gnu project has any. And, of 
course, tell me if it compiles or not.

adrian15

P.S.: I am going to update from Knoppix 4 to Knoppix 5 soon and I think 
I won't hae the lzo problem.