title: Cygwin replace all instances of a character in a text file
body: <p>I have a text file that has numerous instances of the character '^'. I need all those instances replaced with a '['.</p>
  
  <p>I prefer to use cygwin but would use windows command prompt if there is a direct way to do this. My initial instinct was to use Access (no other DB installed) to use the 'replace' function, but as I'm connecting using Jet - apparently this is not possible as per <a href="https://stackoverflow.com/questions/4834536/exception-when-trying-to-execute-replace-against-ms-access">Exception when trying to execute &quot;REPLACE&quot; against MS Access</a></p>
  
  <p>What's the cleanest way to achieve this?</p>