The Revision Control System

 
# initial checkin:
ci -i foo.sh

# checkout:
co foo.sh

# checkout and edit:
co -l foo.sh

# checkin:
ci -u foo.sh

# check what was changed since the last checkout
rcsdiff foo.sh

# check what was changed since rev 1.1 against working copy
rcsdiff -r1.1 foo.sh

# check out specified revision:
co -l -r1.1 foo.sh

# display your log:
rlog foo.sh