title: passing a command to gdb when running a program
body: <p>I am using gdb to debug a program, and I want to have the output of the command </p>
  
  <pre><code>$(perl -e 'print "A"x20') 
  </code></pre>
  
  <p>as my argument. How can I do that? This way the argument would be very flexible. </p>