title: bash: A: unrecognized history modifier
body: <p>After running a c program, giving it some input on the command line (the program simulates a pushdown automata), I get the following response:</p>
  
  <p>bash: A: unrecognized history modifier</p>
  
  <p>I have googled, but I can't find an explanation as to what this means exactly. My program works with other test input, so I assume it's something to do with the input rather than my program (lol).</p>
  
  <p>Cheers in advance</p>
  
  <p>Joe</p>