declare -a SERIAL ACCT IPADD 
let count=0 
while IFS=, read a b c 
do 
    SERIAL[$count]=$a; ACCT[$count]=$b; IPADD[$count]=$c; ((count++)) 
done < file

let i=0 
while [[ $i -lt ${#SERIAL[@]} ]] 
do 
  [[ ${SERIAL[${i}]} = W120* ]] && printf "%s %s\n" ${ACCT[${i}]} ${IPADD[${i}]} 
  ((i++)) 
done

#!/bin/bash
USERLIST="/Users/johndoe/.bin/xBackup_users"
SRCHFOR="W8735UL8Z5V"
#
USERNAME=`awk -F "," '/W8735UL8Z5V/{print $2}' $USERLIST`
PASSWORD=`awk -F "," '/W8735UL8Z5V/{print $3}' $USERLIST`
RSYNCIP=`awk -F "," '/W8735UL8Z5V/{print $4}' $USERLIST`
#
clear
echo
echo Your account name is $USERNAME
echo Your password is $PASSWORD
echo Your IP address is $RSYNCIP
echo
exit

#!/bin/bash
USERLIST="/Users/johndoe/.bin/xBackup_users"
SRCHFOR="W8735UL8Z5V"
#
USERNAME=`awk -F "," '/^'"$SRCHFOR"'/ {print $2}' $USERLIST`
PASSWORD=`awk -F "," '/^'"$SRCHFOR"'/ {print $3}' $USERLIST`
RSYNCIP=`awk -F "," '/^'"$SRCHFOR"'/ {print $4}' $USERLIST`
#
clear
echo
echo Your account name is $USERNAME
echo Your password is $PASSWORD
echo Your IP address is $RSYNCIP
echo
exit

awk -F"," -v pat=$SERIALNUM '$0 ~ pat {print $2,$3}' your_flat_file.txt