A CVS-like front end to P4
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### Description

C4 was originally created to give p4 a CVS feel, by allowing perforce
clients to have writable files and have c4 locate changed files in a way
similar to CVS. This has been expanded to correctly find arbitrary
changes between the current top of tree and the client so that whole
trees can be imported. This is routinely used to import updates to
external source, including updates that can remove/rename whole
directories of files.

C4 provides a control file that is placed at the top of each client to
set environment variables, such as P4PORT and P4CLIENT. For more
information on what c4 does, read the c4 manual.

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