Shell Programming and Scripting

#!/usr/bin/bash
#Script to generate number of active PDP context & calculate PDP activation #failurefrom EPG-M
#Script written by Gbenga Adigun
#September 12, 2013

username="xxxxxx"
password="xxxxxxxxx"

HOSTS=(
		ggsn01
		ggsn02
	  );
	  
##Attempted,Completed & Active PDP Skeleton Template

pdp_command(){
    for a in ${HOSTS[@]}; do
	"${a}pdp"=`sshpass -p "$password" ssh -q "$username"@"$a" "show services epg pgw statistics apn web.net" | grep "Active PDP contexts" | awk '{print $4}'`
    "${a}a1"=`sshpass -p "$password" ssh -q "$username"@"$a" "show services epg pgw statistics apn web.net" | grep "Attempted PDP activations" | awk '{print $4}' | sed '$s/,$//'`
    "${a}c1"=`sshpass -p "$password" ssh -q "$username"@"$a" "show services epg pgw statistics apn web.net" | grep "Attempted PDP activations" | awk '{print $6}'`
	 
	echo `date` "Active PDP Contexts for the past 15 mins is:" $a'pdp'>> /var/ipworks/logs/active_pdp/`date | awk '{ print $2"-" $3"-" $6 }'`"$a_active_pdp".txt
	
	echo $a'a1'
	echo
	echo $a'c1'
	done
}

pdp_command

root###bash -x pdp_stats.sh 
+ username=xxxx
+ password=xxxxxxxx
+ HOSTS=(ggsn01 ggsn02)
+ pdp_command
+ for a in '${HOSTS[@]}'
++ sshpass -p xxxssh -q xxx@ggsn01 'show services epg pgw statistics apn web.net'
++ grep 'Active PDP contexts'
++ awk '{print $4}'
+ ggsn01pdp=
pdp_stats.sh: line 18: ggsn01pdp=: command not found
++ sshpass -p xxxx ssh -q xxx@ggsn01 'show services epg pgw statistics apn web.net'
++ grep 'Attempted PDP activations'
++ awk '{print $4}'
++ sed '$s/,$//'
+ ggsn01a1=
pdp_stats.sh: line 19: ggsn01a1=: command not found

"${a}a1"=...

for ((N=0; N<${#HOSTS[@]}; N++))
do
        AA1[$N]="$(ssh username@${HOSTS[$N]} ... )"
done

# $$ is your shell's PID, which amounts to a convenient random number here
ssh username@${HOSTNAME[$N]} show services epg pgw statistics apn web.net > /tmp/$$ # Run once and save

VAR1="$(awk '/Active PDP contexts/ {print $4}' /tmp/$$)"
VAR2="$(awk '/Attempted PDP activations/ {print $4, $6}' /tmp/$$)"
rm /tmp/$$

ARRAY1=($@)
ARRAY2=( 1 2 3 4 5 .. )
ARRAY3=('some@email.com' 'http://or.internet.com')

# Examples
echo ${ARRAY1[0]}
ARG1
echo ${ARRAY2[2]}
3
echo "${ARRAY3[1]}"
http://or.internet.com