Shell scripting question [newby]

[Malcolm Fitzgerald]

I'm trying to follow the instructions at 
<http://www.daemonology.net/freebsd-upgrade-5.4-to-6.0/>

At point four it offers this shell script.

cut -f 1 -d '$' /usr/local/freebsd-update/work/md5all | uniq |
         while read X; do
                 if [ -f $X ]; then echo $X; fi;
         done | sort > /root/base-old

Running this from root shell in konsole (bash) I get "while: Expression 
Syntax". The various hints and clues I get from the shell, the web and 
man bash haven't helped me. Would someone provide the correct syntax 
for me?


thanks

malcolm