[ILUG] shell quiz !

[John P . Looney]

 Here's a little puzzler. Seeing as "seq" only works in decimals, it's a
little tricky.

 Basically, if someone gives me a pair of IP's, like

    10.55.2.9
and 
    10.10.29.2

 I want something like a "for $ip in $ips" type loop. I'm thinking at the
moment, something like:

IP_start=10.10.2.9
IP_end=10.10.6.0

for i in `seq 1 4`
do
    eval "IP_start_$i=`echo $IP_start | cut -f$i -d. `"
    eval "IP_end_$i=`echo $IP_end | cut -f$i -d. `"
done

 counter1=$IP_start_1
 while [ $counter1 -le $IP_end_1 ] ; do
   counter2=$IP_start_2
   while [ $counter2 -le $IP_end_2 ] ; do
     counter3=$IP_start_3
     while [ $counter3 -le $IP_end_3 ] ; do
       counter4=$IP_start_4
       while [ $counter4 -le $IP_end_4 ] ; do
         echo "$counter1.$counter2.$counter3.$counter4"
         counter4=$((counter4+1))
       done
       counter3=$((counter3+1))
     done
     counter2=$((counter2+1))
   done
   counter4=$((counter4+1))
 done

 But, how do I do the "base 256" thing ?

-- 
 When I say 'free', I mean 'free': free from bond, of chain or command: 
to go where you will, even to Mordor, Saruman, if you desire. " 
    -- Gandalf, paraphrasing the choice between Free and Non-free software