Executing Shell Scripts

I have a shell script that I obtained on line to setup ipchains.  I can
execute this script on my production box ( I just tried to test it) but
I can't run it on my text Linux box.  Every time the script tries to
execute an IF statement, it returns "syntax error: unexpected end of
file".  I am wondering if I am missing a package that interprets this
kind of stuff or if there is something I should be including in my
execute statement for this script.  Any help would be appreciated.

Robert Paré
Network Administrator
Cypher Systems Group
519.945.4943 Phone
519.974.7290 Fax