title: What does | tr -d do in bash?
body: <h3>Can someone walk through what this code is doing?</h3>
  
  <pre><code>if [ -f "saved.txt" ]; then                // What does -f do?
      rm saved.txt
  fi
  
  in=$(echo "{query}" | tr -d "\\")          // How does this work? 
                                             // What does | tr -d "\\" mean?
  
  echo "$in" &gt; saved.txt                     // Is this simply putting the 
                                             // value of $in into saved.txt?
  </code></pre>