Thanks that did the trick. Do you know if there is an easy way to get
the last result, or everything without having to do so many "gets"? I
tried .each and readlines but with not much success. Or at least a way
to determine when the last line has been "get"en without error-ing out?
>> max = IO.popen("maxima", "w+")
=> #<IO:0x201bccc>
>> max.puts "1+1;"
=> nil
>> max.gets
=> "Maxima 5.15.0 http://maxima.sourceforge.net\n";
>> max.gets
=> "Using Lisp SBCL 1.0.17\n"
>> max.gets
=> "Distributed under the GNU Public License. See the file COPYING.\n"
>> max.gets
=> "Dedicated to the memory of William Schelter.\n"
>> max.gets
=> "The function bug_report() provides bug reporting information.\n"
>> max.gets
=> "(%i1) \n"
>> max.gets
=> "(%o1) 2\n"
>> max.puts "1+9;"
=> nil
>> max.gets
=> "(%i2) \n"
>> max.gets
=> "(%o2) 10\n"
>> max.gets
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