Under Mac OS X, an alternative to using the svn command line is to use svnX

Install

Download svnx and run it (Note that the location of SvnX is likely to change)
If, when you click on the svn.app icon, you get this error message: svnX.app can't be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers, do the following: Go to System Preferences > Security & Privacy > General > Allow applications downloaded from > Anywhere. You should then be able to download the svnx dmg file
Open the SvnX dmg file and drag the svnx application into your /Applications directory.

Set up the Repository

1. Start up SvnX, which should bring up the Booksmarks window

2. In SvnX, create a new Repo by clicking on the small gear in the bottom left and selecting Add Repository

3. In the SvnX Repository Window, click on the + and enter

Name: The name of the repo, can be anything by typically is the name of the svn repo
Path: Remove the svn:// and replace it with the http://... for the repo. The various websites have a link at the bottom for a help page for updating. In general, use the url that is before the /trunk/ portion
- For Ptolemy II, see http://chess.eecs.berkeley.edu/ptexternal
  - For anonymous read-only access, use: https://repo.eecs.berkeley.edu/svn-anon/projects/eal/ptII/
  - For read/write access, use: https://repo.eecs.berkeley.edu/svn/projects/eal/ptII
- For TerraSwarm, use https://repo.eecs.berkeley.edu/svn/projects/terraswarm/terraswarmwww/
User: Your user name on the svn server. For people with UCB EECS LDAP accounts, this will be your user name. For people without UCB EECS LDAP accounts who are accessing repos on http://repo.eecs.berkeley.edu, this will be your email address, including the @ sign and the domain name, for example cxbrooks@gmail.com
Password: Your password

The first time a repository host is accessed, you might get an error about "Certificate Verification Failed":

The solution is to start up the Terminal (Applications -> Utilities -> Terminal) and then run the command by hand a permanently accept the certificate.

The command to run is svn co followed by the URL, for example svn co https://repo.eecs.berkeley.edu/svn/projects/terraswarm/terraswarmwww/ and then type a p to permanently accept the certificate. Note that the command does not actually need to successfully complete and download the repo. What the command is doing is downloading the certificate so that when Svnx runs, the certificate is found.

(Admins, see Subversion -> svn Certificate is not Issued by a Trusted Authority for details.)

If you get an error about "unable to connect"check to make sure you are using the correct login and password. For EECS at UC Berkeley, this is your EECS account, not your desktop login, or CalNet credentials.

4. On the left, double click on the repository that was just created, this will bring up the Repository Window (see below), which will access the repository (it may take a few minutes). Then select the most recent revision by clicking on the small circle at the left of the first line. The bottom pane should now list the contents of the repository

5. In the Repository pane at the bottom, click on the trunk, then click on the checkout button at the top. A file browser appears. Browse to the Documents folder, click on New Folder, create a folder with the same name and click Checkout. This checks a working copy of the tree and brings up a Working Copies window with the new repository.

Creating the new folder

About to hit the Checkout button

To see the output, click on the Output button in the upper right. A large repository make take a few minutes to download.

6. After the checkout is complete, in the Bookmarks Window, under Repositories, click on the trunk that was just checked out.

7. A browser for the working copy comes up. If necessary, click on the list icon below the close button in the upper left:

Click on the left most-menu above the View text. Here, the tooltip text is shown because we hovered over the icon.

The working directory.

8. To edit a file, click on the blue bar to the left of the file name. If TextEdit renders the HTML instead of showing the HTML source, then in TextEdit, select Preferences, then the Open and Save Tab and check "Display HTML files as HTML code instead of formatted text" and then close the preferences window

9. Make your changes, save the file, then in the svnX working directory window, highlight the file and click on the Commit icon at the top of the window.

10. If the repo is a website, then go to the website and update the website by clicking on the Update link at the bottom.

Making changes after setting up.

After doing the above set up steps, to make a change:

1. Start up svnX

2. Window -> Working Copies

3. Select your working copy by double clicking, the working copy window opens up

4. Important: Hit the update button to get any changes that someone else may have made in the interim

5. Then, edit your file and commit as above.