int cat(path, start, num)
string path;
int start, num;

List the file found at "path". It is not legal to have '.' or spaces
in the path. This commands is normally connected to the "cat" command
that wizards have. It is also used by the "help" command. The optional
arguments 'start' and 'num' makes is start line number, and number of lines.
If they are not given, the whole file is printed from the beginning.

The total number lines will not exceed a system limit, which normally
is 40 lines.

cat() returns 1 if success, 0 if no such file or no such lines.

See also efun/ls efun/file_size