I figured it out last night. The problem was that the first line of the
input file did not define the Output variable, so awk didn't know where
to send it's output. Thanks if you tried to help!
Final Program:
#!/bin/sh
#
#
awk 'BEGIN {
Output="/dev/null"
}
{
if ($0 ~ "^IXXPS2-") Output=$1
print >>Output
}'