title: How do I use '_' and other characters on LaTeX?
body: <p>I need to put samples of some command lines in a LaTeX file, but every time I try to use some characters (such as <code>_</code>) I get the  " !Missing $ inserted" error.</p>
  
  <p>How can I write strings such as:</p>
  
  <pre><code>./configure FC=gfortran  --with-cuda --without-mpi FLAGS_CHECK="-g -O2" FLAGS_NO_CHECK="-g -O2 -ffree-line-length-none -I../shared/ -L/usr/local/cuda/lib64  -fopenmp"
  </code></pre>
  
  <p>Without having to use <code>$</code>...<code>$</code>? (I don't want it to look like a math expression.)</p>