CVS:
First step: when you try to get it for the first time
cvs -d:pserver:anonymous@xawdecode.cvs.sourceforge.net:/cvsroot/xawdecode login
(Type no password)
cvs -z3 -d:pserver:anonymous@xawdecode.cvs.sourceforge.net:/cvsroot/xawdecode co xawdecode
Second step: For every updates
cvs update -dP