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(cvsclient.info)Filenames

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Conventions regarding transmission of file names
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   In most contexts, `/' is used to separate directory and file names
in filenames, and any use of other conventions (for example, that the
user might type on the command line) is converted to that form.  The
only exceptions might be a few cases in which the server provides a
magic cookie which the client then repeats verbatim, but as the server
has not yet been ported beyond unix, the two rules provide the same
answer (and what to do if future server ports are operating on a
repository like e:/foo or CVS_ROOT:[FOO.BAR] has not been carefully
thought out).

   Characters outside the invariant ISO 646 character set should be
avoided in filenames.  This restriction may need to be relaxed to allow
for characters such as `[' and `]' (see above about non-unix servers);
this has not been carefully considered (and currently implementations
probably use whatever character sets that the operating systems they
are running on allow, and/or that users specify).  Of course the most
portable practice is to restrict oneself further, to the POSIX portable
filename character set as specified in POSIX.1.