Wondering if anybody can help with changing the output of a field. I'm needing to change the output of a field in this file:

User Process ID Time Active Licences Type
ChangeAdmin (Phys-agsdev/19353 212), start Wed 1/21 6:30 (linger: 1800)
u414013 (Phys-agsdev/19353 1491), start Wed 1/21 12:54 (linger: 1800)
z001429 (Phys-agsdev/19353 788), start Wed 1/21 13:03 (linger: 1800)
u414014 (Phys-agsdev/19353 1009), start Wed 1/21 10:34
z311203 (Phys-agsdev/19353 2368), start Wed 1/21 10:52
u414020 (Phys-agsdev/19353 879), start Wed 1/21 11:43
z311260 (Phys-agsdev/19353 1523), start Wed 1/21 12:17
oracled (Phys-agsdev/19353 555), start Wed 1/21 9:00
u414013 (Phys-agsdev/19353 1717), start Wed 1/21 12:56

The field which says "(linger: 1800)" is field 13. What I want to do is, if it contains "(linger: 1800)", I want it to say "ChangeBase", or if it is blank, I want it to say "CMBase". Here's the code I have, with an if statement, but it has no affect whatsoever!

BEGIN {
print
print "User Process ID Time Active Licence Type"
print
}
NF > 11{changebaselicences++}
NF < 12{cmbaselicences++}
{
if ($13 == / /) {print "CMBase"}
if ($13 ~ /linger/) {print "ChangeBase"}
print $4, $6, $7, $8, $9, $10, $11, $12, $13
}
END {
printf "\nUsers of SYNERGY-ChangeBase: (Total of 11 licenses issued; Total of %-2d", changebaselicences
print " licences in use)"
printf "\nUsers of SYNERGY-CMBase: (Total of 12 licenses issued; Total of %-2d", cmbaselicences
print " licences in use)"
print
}


Many thanks in advance.