Mercurial is the easiest revision control system I've used, "and so can you" to quote Stephen Colbert. I became interested in the idea of a distributed SCM tool in order to keep my revision history with me while I'm on the road and not necessarily connected. I would have assumed that to get that power, the tool would be more complex - you can't get something for free, right? However, Mercurial is so easy to use, I'm using it for simple one-off revision needs.
Consider the case of a lone developer with a modest number of files to keep track of. To use Mercurial, all he needs to do change into the directory where the files are and run:hg init
That creates a repository, hidden in the .hg subdirectory, and sets the directory up as a working directory. The hg status command shows that none of the files is under control, yet. Running hg add * (or whatever subset of the files is appropriate) marks all of the files to be added to the repository. Finally, hg commit commits the files.
The real beauty was in that first step - hg init. That is so much easier than CVS or Subversion where you either have to create a new repository or figure out where in an existing repository you want to put these files. And it's easier than the dinosaurs, RCS and SCCS, where you have to set up subdirectories to hold the version files in every subdirectory - not to mention the fact that those tools don't really deal with multiple users.
Mercurial is about as simple as can be, and if you never work with multiple developers and passing changes around between developers and repositories, then it stays that simple. Period.
enjoy,
Charles.
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