Package: cvs

"cvs" package binaries on CentOS:

/usr/bin/cvsbug /usr/bin/cvs /usr/bin/rcs2log

You may install this package on CentOS with yum install cvs

"cvs" package binaries on Debian:

/usr/bin/cvs /usr/bin/cvs-switchroot

You may install this package on Debian with apt-get install cvs