In all of the administrative files, a
# at the beginning of a line
signifies a comment; that line is ignored by CVS. A backslash preceding
a newline quotes the newline out of existence.
Some of the files (commitinfo, loginfo, taginfo, and rcsinfo) share more syntactic conventions as well. In these files, on the left of each line is a regular expression (which is matched against a file or directory name), and the rest of the line is a program, possibly with arguments, which is invoked if something is done to a file matching the regular expression. The program is run with its working directory set to the top of the repository.
In these files, there are two special regular expressions that may be used: ALL and DEFAULT. ALL matches any file or directory, whether or not there is some other match for it, and DEFAULT matches only if nothing else matched.