This is rcsweb, a simple interface to RCS, the Revision Control System.
The purpose of rcsweb is to provide a convenient interface to commonly used RCS commands.
rcsweb runs as a setuid/setgid program, which takes on the identity of the remote web user. It allows the remote user to execute a small subset of RCS (e.g. co -l, ci -u, rcsdiff, rlog).
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