"When you're editing text, you may find yourself with two or three similar versions of a file. Often you are not sure which file has what content, what was deleted in one, what was added in another, and where exactly. You know what content your file should contain, but you are not sure which version to start from. It's one of those moments you wish your computer were smart enough to understand your problem and fix it for you. Well, that's not going to happen, but there is an open source application that you can run to help. Meet Meld, a visual diff and merge tool.
"With Meld you can compare two or three files and edit them in place (diffs update dynamically). You can compare two or three directories and launch file comparisons. And lastly, you can browse and view a working copy from a popular version control systems such as CVS, Subversion, Bazaar, or Mercurial..."
