problems in batching files in xmaxima&texmacs

> the maxima invitation string does not appear... if I batch file
> that has the comments at the end. 

Interactive xmaxima has similar issues.  It requires input commands to
end with semicolon or dollarsign immediately followed by a return.  In
the following examples, Xmaxima does not process the "x;" command, and
waits for more input:

  x;<space><return>
  x;y<return>
  x; /* xxx */<return>

In the original (Maclisp / ITS / PDP-10) Macsyma, if I remember
correctly, it recognized the complete command as soon as the ";" or "$"
was typed, and did not wait for a <return>.  Even in line-at-a-time mode
(which was used by some remote users), the input line "x;y" would
process the "x;" command and only then start parsing the type-ahead
input "y".

That interaction style is probably unfamiliar to most users nowadays,
who expect to have to type a <return> or a control sequence to get
immediate response.  Ironic, because the purpose of the <return>
convention is to allow line-at-a-time I/O for efficiency on telecom
lines and I/O front end processors, which are irrelevant in a personal
computer era.

In testing these cases, I also discovered a more trivial issue:

The following input line:

   (C15) ";<return>";

correctly parses as a string with an embedded <return>, but the <return>
does not echo on the screen.  (Reported as 917277.)

      -s