This is a nice script for iperf tests:

#!/bin/bash
# A menu driven shell script sample template 
## ----------------------------------
# Step #1: Define variables
# ----------------------------------
RED='\033[0;41;30m'
STD='\033[0;0;39m'

#Get current interface:
 curint=`ip addr | grep 'state UP' | awk -F: '{print $2}' `
if [ -z "${curint}" ]; then
 echo "The interface is down, please make sure you are connected to the network"
 exit 0
fi
if [ -z "${curint+set}" ]; then
 echo "The interface is down, please make sure you are connected to the network"
 exit 0
fi
if [ -z "${curint-unset}" ]; then
 echo "The interface is down, please make sure you are connected to the network"
 exit 0
fi
if [ -n "${curint}" ]; then
 echo "The interface ${curint} is UP"
fi

#Get current ip address:
# curadres=`ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/'`
 curadres=`ip addr | grep 'state UP' -A2 | grep "inet " | awk '{print $2}'`
if [ -z "${curadres}" ]; then
 echo "The ip address is not set"
 read -p "Enter your ip address:" myaddress
 ifconfig ${curint} ${myaddress}/24
fi
if [ -n "${curadres}" ]; then
 echo "The ip address is set and is: ${curadres}"
fi

#Give remote ip address:
 read -p "Enter remote ip address:" address
 address2="${address}"
#Give tiem to test is seconds: 
 read -p "How long do you want to test (in seconds)?:" time
 time2="${time}"

 
# ----------------------------------
# Step #2: User defined function
# ----------------------------------
pause(){
 read -p "Press [Enter] key to continue..." fackEnterKey
}
 
one(){
 echo "Set iperf Server TCP"
 now=$(date +"%F_%H%M%S")
 LOG_FILE="/root/iperf-data/$now-tcp-server.txt"
 /bin/iperf -s -p 5001 > >(tee -a ${LOG_FILE} ) 
}
 
two(){
 echo "Set iperf Client 8K"
 now=$(date +"%F_%H%M%S")
 read -e -i "$address2" -p "Enter remote ip address:: " address3
 address2="${address3:-$address2}"
 read -e -i "${time2}" -p "How long do you want to test (in seconds)?:" time3
 time2="${time3:-$time2}"
 echo "Remote Address: $address3 Time: $time3"
 /bin/iperf -c $address3 -p 5001 -t $time3 -i 1 -w 8K | tee "/root/iperf-data/$now-tcp-8K-client.txt"
}
 
three(){
 echo "Set iperf Client 64K"
 now=$(date +"%F_%H%M%S")
 echo "Remote Address: $address Time: $time"
 read -e -i "$address2" -p "Enter remote ip address:: " address3
 address2="${address3:-$address2}"
 read -e -i "${time2}" -p "How long do you want to test (in seconds)?:" time3
 time2="${time3:-$time2}"
 echo "Remote Address: $address3 Time: $time3"
 /bin/iperf -c $address3 -p 5001 -t $time3 -i 1 -w 64K | tee "/root/iperf-data/$now-tcp-64K-client.txt"
}
 
four(){
 echo "Set iperf Server UDP"
 now=$(date +"%F_%H%M%S")
 LOG_FILE="/root/iperf-data/$now-udp-server.txt"
 /bin/iperf -s -p 5001 -u > >(tee -a ${LOG_FILE} )
}
 
five(){
 echo "Set iperf Client UDP 1000Mbps"
 now=$(date +"%F_%H%M%S")
 echo "Remote Address: $address Time: $time"
 read -e -i "$address2" -p "Enter remote ip address:: " address3
 address2="${address3:-$address2}"
 read -e -i "${time2}" -p "How long do you want to test (in seconds)?:" time3
 time2="${time3:-$time2}"
 read -p "Enter bandwidth to test on (in Mbps):" speed
 speed2="${speed}"
 echo "Remote Address: $address3 Time: $time3"
 /bin/iperf -c $address3 -p 5001 -t $time3 -i 1 -u -b ${speed}m | tee "/root/iperf-data/$now-udp-client.txt"
}
 
# function to display menus
show_menus() {
 clear
 echo "~~~~~~~~~~~~~~~~~~~~~~~~" 
 echo " iperf M A I N - M E N U"
 echo "~~~~~~~~~~~~~~~~~~~~~~~~" 
 echo "" 
 echo "1. Set iperf Server TCP"
 echo "2. Set iperf Client 8K"
 echo "3. Set iperf Client 64K"
 echo "~~~~~~~~~~~~~~~~~~~~~~~~" 
 echo "4. Set iperf Server UDP"
 echo "5. Set iperf Client UDP"
 echo "6. Exit"
}
# read input from the keyboard and take a action
# invoke the one() when the user select 1 from the menu option.
# invoke the two() when the user select 2 from the menu option.
# Exit when user the user select 3 form the menu option.
read_options(){
 local choice
 read -p "Enter choice [ 1 - 6] " choice
 case $choice in
 1) one ;;
 2) two ;;
 3) three;;
 4) four;;
 5) five;;
 6) exit 0;;
 *) echo -e "${RED}Error...${STD}" && sleep 2
 esac
}
 
# ----------------------------------------------
# Step #3: Trap CTRL+C, CTRL+Z and quit singles
# ----------------------------------------------
trap '' SIGINT SIGQUIT SIGTSTP
 
# -----------------------------------
# Step #4: Main logic - infinite loop
# ------------------------------------
while true
do
 
 show_menus
 read_options
done