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-.TH CVS 1
-.SH NAME
-cvs \- introduction using plan9port CVS repository
-.SH SYNOPSIS
-.B cvs
-.B -d
-.B :pserver:anoncvs@cvs.pdos.csail.mit.edu:/cvs login
-.PP
-.B cvs
-.B -d
-.B :pserver:anoncvs@cvs.pdos.csail.mit.edu:/cvs checkout plan9
-.PP
-.B cvs
-.B update
-[
-.B -dP
-]
-[
-.I path ...
-]
-.PP
-.B cvs
-.B status
-[
-.I path ...
-]
-.PP
-.B cvs
-.B diff
-[
-.B -D
-.I date
-]
-[
-.B -r
-.I revision
-]
-[
-.B -cu
-]
-[
-.I path ...
-]
-.PP
-.B web
-.B http://cvs.pdos.csail.mit.edu/cvs/plan9/
-.SH DESCRIPTION
-The master source tree for Plan 9 from User Space is maintained
-using the source control system CVS
-as a poor substitute for Plan 9's
-\fIreplica\fR(8) and dump file system.
-(It is maintained simultaneously using Mercurial; see
-.IR hg (1).)
-.PP
-The first argument to
-.I cvs
-is a command, which determines the form of the rest of the command line.
-.PP
-The
-.B login
-command authenticates to the remote server and records your password in
-.BR $HOME/.cvspass .
-Use an empty password: when prompted, type a newline.
-.PP
-The
-.B checkout
-command downloads a copy of the tree into the directory
-.BR plan9 ,
-which it will create.
-The argument
-.B plan9
-is both the name of the created directory and the name used to
-tell the server which tree you want.
-If you want to use a different name locally, rename the directory
-after running the command.
-.PP
-From directories within the
-.B plan9
-tree, the awkward
-.B -d
-is no longer necessary.
-.PP
-.I Cvs
-.I update
-incorporates recent changes from the CVS tree
-into the local copy.
-If the changes cannot be merged because of locally-made changes
-that are in the way,
-.I cvs
-will leave a note in the file showing the differences between the local
-and remote file.
-.PP
-The
-.B -d
-flag to
-.I cvs
-.I update
-causes
-it to update subdirectories as well.
-The
-.B -P
-flag causes
-.I cvs
-.I update
-to remove directories that have been emptied.
-.PP
-.I Cvs
-.I status
-displays the version number (also called a revision number)
-for the local copy of the named files,
-as well as the number of the most recent version on the server.
-Version numbers are of the form
-.RI 1. n \fR,
-where
-.I n
-is a sequence number starting at 1.
-.PP
-.I Cvs
-.I diff
-runs Unix's
-.IR diff (1)
-to compare files in the local tree with the corresponding files in
-the CVS tree.
-By default it compares against the version that was most recently
-incorporated into the local tree.
-The
-.B -r
-flag specifies an alternate version to compare against.
-The special revision
-.B HEAD
-refers to the most recent version on the server.
-The
-.B -D
-flag instructs
-.I cvs
-.I diff
-to use the version as of the given date.
-Almost any imaginable date format is acceptable:
-.BR 20050110 ,
-.BR 1/10/2005 ,
-.B 'Jan
-.BR 10' ,
-.BR yesterday ,
-.B 'last
-.BR week ',
-.B 'two
-.B days
-.BR ago' ,
-.B 'a
-.B fortnight
-.BR ago' ,
-and so on.
-If two
-.B -r
-or
-.B -D
-options are given,
-those two versions are compared, and the local copy is ignored.
-.PP
-.I Cvs
-.I diff
-passes the
-.B -u
-or
-.B -c
-options to the Unix
-.IR diff .
-.PP
-If you download a tar file from the web
-instead of checking out the tree with CVS,
-you can still use the
-.I update
-and
-.I diff
-commands to stay up-to-date and to see what has changed.
-You will need to run the
-.I cvs
-.I login
-command first to create your
-.B .cvspass
-file.
-.PP
-The CVS tree can be inspected on the web at
-.HR http://cvs.pdos.csail.mit.edu/cvs/plan9/ "" .
-.SH EXAMPLES
-Incorporate any changes made to the CVS tree since
-the last check out or update:
-.IP
-.EX
-cd $PLAN9
-cvs up -dP
-.EE
-.PP
-Compare
-.I libdraw
-against its source from January 1, 2005:
-.IP
-.EX
-cd $PLAN9/src/libdraw
-cvs diff -D20050101
-.EE
-.PP
-Check the entire tree for changes made locally:
-.IP
-.EX
-cd $PLAN9
-cvs diff
-.EE
-.PP
-Check the entire tree for changes between the local version and
-the most recent in the CVS tree.
-This does not indicate which changes are local ones
-and which are changes to the CVS tree that have not yet been
-incorporated into the local tree.
-.IP
-.EX
-cd $PLAN9
-cvs diff -r HEAD
-.EE
-.PP
-Make
-.I cvs
-less chatty by setting the global
-.B -q
-flag implicitly on every CVS command:
-.EX
-cd $HOME
-echo 'cvs -q' > .cvsrc
-.EE
-.SH FILES
-.TP
-.B CVS
-directory containing CVS metadata for parent
-.TP
-.B .cvsignore
-list of files and wildcards to exclude from CVS operations in this directory
-.SH SEE ALSO
-.IR hg (1)
-.PP
-Unix's
-\fIcvs\fR(1),
-.HR http://www.cvshome.org/
-.PP
-.HR http://cvs.pdos.csail.mit.edu/cvs/plan9/
-.SH BUGS
-The CVS server is a read-only public copy of a private tree.
-The dates on versions reflect the date the changes were made in the
-private tree, not the date the change was made public.
-.PP
-On Mac OS X,
-.I cvs
-will complain during a checkout that some files in
-.B $PLAN9/troff/font/devutf
-are ``in the way.''
-This is due to the Mac case-insensitive file system
-and the fact that troff has some (rarely used)
-files whose names differ only in case.