Is there a better way I could have run this loop. (For loop with two variables)

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# 1  
Is there a better way I could have run this loop. (For loop with two variables)

Sorry for such a dreadful title, but I'm not sure how to be more descriptive. I'm hoping some of the more gurutastic out there can take a look at a solution I came up with to a problem, and advice if there are better ways to have gone about it.

To make a long story short around 20K pieces of equipment de-registered, and the only way to re-register them relies on using a manual script that needs the equipments MAC address and IP address. Unfortunately there is no current way to run the script against a file with the information. So I decided that a loop would be the best way to go about it.

What I wound up doing was creating a pipe delimited file with the equipment info, and running the following against it:

[mystro@mys-nycnm-srv01 scripts]$ head -5 IP

[mystro@mys-nycnm-srv01 scripts]$ for i in `cat IP`;do mac=$(echo "$i"|cut -f1 -d\|);ip=$(echo "$i"|cut -f2 -d\|);/usr/local/mystro/scripts/mdiags cid reg $mac $ip;done

It worked perfectly, but as I'm (obviously) not the most skilled scripter I always like to hear critiques from more experienced people.

IE: Should I have not used there an easier way to isolate the info than cut...etc.
# 2  
Here's another way, using only shell
while read line; do
     /usr/local/mystro/scripts/mdiags cid reg ${line%|*} ${line#*|}
done < IP

${line%|*} extracts the MAC address
${line#*|} extracts the IP address
# 3  
I think if we have to do 20k loops, better use nawk:

nawk -F"|" '{system("/usr/local/mystro/scripts/mdiags cid reg "$1" "$2)}' IP


tr "|" " " < IP |xargs -I {} /usr/local/mystro/scripts/mdiags cid reg {}

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