title: replace a particular text in all the files using single line shell command
body: <p>I have a renamed js file which I have to call in each of my php pages. Now I want to replace that old name with the new one using shell.
  what iam using is this:</p>
  <pre><code>sed -i ’s/old/new/g’ *
  </code></pre>
  <p>but this is giving the following error:</p>
  <pre><code>sed: -e expression #1, char 1: unknown command:
  </code></pre>
  <p>How can I do this replacement?</p>