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# D. All environment variables which affect CVS

This is a complete list of all environment variables that affect CVS.

`$CVSIGNORE`
  A whitespace-separated list of file name patterns that CVS should ignore. See section C.9 Ignoring files via cvsignore.

`$CVSWRAPPERS`
  A whitespace-separated list of file name patterns that CVS should treat as wrappers. See section C.2 The cvswrappers file.

`$CVSREAD`
  If this is set, `checkout` and `update` will try hard to make the files in your working directory read-only. When this is not set, the default behavior is to permit modification of your working files.

`$CVSUMASK`
  Controls permissions of files in the repository. See 2.2.2 File permissions.

`$CVSROOT`
  Should contain the full pathname to the root of the CVS source repository (where the RCS files are kept). This information must be available to CVS for most commands to execute; if `$CVSROOT` is not set, or if you wish to override it for one invocation, you can supply it on the command line: ``cvs -d cvsroot cvs_command...`' Once you have checked out a working directory, CVS stores the appropriate root (in the file ``CVS/Root`'), so normally you only need to worry about this when initially checking out a working directory.

`$EDITOR`
`$CVSEDITOR`
`$VISUAL`
  Specifies the program to use for recording log messages during commit. `$CVSEDITOR` overrides `$EDITOR`. See 1.3.2 Committing your changes.

`$PATH`
  If `$RCSBIN` is not set, and no path is compiled into CVS, it will use `$PATH` to try to find all programs it uses.

`$HOME`
`$HOMEPATH`
`$HOMEDRIVE`
  Used to locate the directory where the ``.cvsrc`' file, and other such files, are searched. On Unix, CVS just checks for `HOME`. On Windows NT, the system will set `HOMEDRIVE`, for example to ``d:`' and `HOMEPATH`, for example to ``\joe`'. On Windows 95, you'll probably need to set `HOMEDRIVE` and `HOMEPATH` yourself.

`$CVS_RSH`
  Specifies the external program which CVS connects with, when `:ext:` access method is specified. see section 2.9.2 Connecting with rsh.

`$CVS_SERVER`
  Used in client-server mode when accessing a remote repository using RSH. It specifies the name of the program to start on the server side when accessing a remote repository using RSH. The default value is `cvs`. see section 2.9.2 Connecting with rsh

`$CVS_PASSFILE`
  Used in client-server mode when accessing the `cvs login server`. Default value is ``$HOME/.cvspass`'. see section 2.9.3.2 Using the client with password authentication

`$CVS_CLIENT_PORT`
  Used in client-server mode when accessing the server via Kerberos, GSSAPI, or CVS's password authentication if the port is not specified in $CVSROOT. see section 2.9 Remote repositories

`$CVS_RCMD_PORT`
  Used in client-server mode. If set, specifies the port number to be used when accessing the RCMD demon on the server side. (Currently not used for Unix clients).

`$CVS_CLIENT_LOG`
  Used for debugging only in client-server mode. If set, everything sent to the server is logged into ```$CVS_CLIENT_LOG`.in`' and everything sent from the server is logged into ```$CVS_CLIENT_LOG`.out`'.

`$CVS_SERVER_SLEEP`
  Used only for debugging the server side in client-server mode. If set, delays the start of the server child process the specified amount of seconds so that you can attach to it with a debugger.

`$CVS_IGNORE_REMOTE_ROOT`
  For CVS 1.10 and older, setting this variable prevents CVS from overwriting the ``CVS/Root`' file when the ``-d`' global option is specified. Later versions of CVS do not rewrite ``CVS/Root`', so `CVS_IGNORE_REMOTE_ROOT` has no effect.

`$COMSPEC`
  Used under OS/2 only. It specifies the name of the command interpreter and defaults to CMD.EXE.

`$TMPDIR`
`$TMP`
`$TEMP`
  Directory in which temporary files are located. The CVS server uses `TMPDIR`. See section A.4 Global options, for a description of how to specify this. Some parts of CVS will always use ``/tmp`' (via the `tmpnam` function provided by the system).

  On Windows NT, `TMP` is used (via the `_tempnam` function provided by the system).

  The `patch` program which is used by the CVS client uses `TMPDIR`, and if it is not set, uses ``/tmp`' (at least with GNU patch 2.1). Note that if your server and client are both running CVS 1.9.10 or later, CVS will not invoke an external `patch` program.

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