title: Running gmt.script
body: <p>I try to run a gmt-script and get the message:</p>
  
  <p><code>bash-3.2$ plot_scenario.gmt
  bash: plot_scenario.gmt: command not found</code></p>
  
  <p>Does anyone know what could fix the problem?
  I got a script from my supervisor, and it worked just fine on the uni Linux pc. 
  I have a Mac OS. </p>