/usr/bin/co is in rcs 5.9.4-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
# co (GNU RCS) 5.9.4
#
# Copyright (C) 2013-2015 Thien-Thi Nguyen
#
# This file is part of GNU RCS.
#
# GNU RCS is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GNU RCS is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
d=`echo "$0" | sed 's|[^/]*$||'`
exec "$d"rcs co "$@"
# co ends here
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