Work with CVS

Work with CVS in $G/src to update and commit changes

Everything described here assumes you are inside the directory that constains your source code.

ADD A NEW FILE: Once you created such file use the command:
```
 cvs add filename
```
to add it to the repository.
COMMIT CHANGES: After you add a new file or change an existing one, you must commit the changes using the command:
```
 cvs commit -m "I just added some stuff and this is my comment"
```
Note that if several people are working on the same code and someone else commits changes before you do, CVS will not let you commit until you update your code first. See the next point to see how to do that.
UPDATE YOUR CODE: If you have your code checked out in several places, such as your CS account and your laptop, once you commit changes in one place you will need to update the other location to get those changes. To do that you run the command:
```
 cvs update
```
To update and pull in a newly created directory, the command is:
```
 cvs update -d 
```
CHECK OUT YOUR CODE AT ANOTHER $G SITE: Since $G/src is itself inside CVS this is what you do to "checkout" your project at a new $G site:
```
 cvs update -d myproject 
```
IMPORTANT! Remember to include tha name of the project to be checked out ("myproject"), otherwise you will checkout every possible project in $G/src.
TAGGING A RELEASE: Anytime you commit changes and install them in $G, it would be a good idea to tag that version as a realease. CVS will tag the current state of all your code and you will be able to retrieve it using the tag name. To tag a release, after you commit the changes run:
```
 cvs tag mytagname 
```
To retrieve an existing tagged release run:
```
 cvs co -r mytagname 
```
When you want to checkout your code at a new location and you want a specific release instead of the latest version, run:
```
 cvs checkout -r mytagname module 
```
REMOVING CODE: To remove a file you have to delete it first and then eliminate it from the repository. For this you run:
```
 rm filename 
```
```
 cvs remove filename 
```
As always, for the change to take effect you must
```
 cvs commit -m "I just deleted a bunch of things" 
```
If you want to remove a directory, first you delete all files in that directory. Then you run:
```
 cvs update -P 
```
This command "prunes" all the empty directories.