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Hi, you need to double quote $2 as well, otherwise the * will get expanded by the shell.

You can also use a case statement, then you do not need to quote the variable
case $2 in
\*|+|-|/) ...

-F '[ =.]' makes space/=/. as field separators.
NF - NumberofFields

12.12.52.125.in-addr.arpa name = hostname.domain.main.gov

'gov' - last field (NF)
'main' - next to last field...

echo "12.12.52.125.in-addr.arpa name = hostname.domain.main.gov" | nawk -F'[ =.]' '{close(out);out=$(NF-2);print $(NF-3)>>out}'

echo "12.12.52.125.in-addr.arpa name = hostname.domain.main.gov" | awk -F"="
'{print $2}'

-eq | equal
-ne | not equal
-gt | greater than
-lt | less thandone is used to end a loop :

while [ condition ... ]
do
cmd1
cmd2
...
done


for i in $LIST
do
cmd1
cmd2
...
done

#!/bin/sh

addnumbers()
{ if [ $# -eq 2 ]; then
#in this line space after "[" and before "]" are important! $# stand for the number of arguments
sum=`expr $1 + $2`
#in...