Linux Script test network speed

Example:./netspeed eth0

1 #!/bin/bash

2
3 interval= "1" # Update INTERVAL in seconds
4
5 if [-Z ']; Then
6 Echo
7 echo Usage: $ [network-interface]
8 Echo
9 echo e.g. $ eth0
Ten Echoes
Exit
Fi
13
If=$1
15
While True
+ Do
r1= ' Cat/sys/class/net/$1/statistics/rx_bytes '
t1= ' Cat/sys/class/net/$1/statistics/tx_bytes '
Sleep $INTERVAL
R2= ' Cat/sys/class/net/$1/statistics/rx_bytes '
T2= ' Cat/sys/class/net/$1/statistics/tx_bytes '
tbps= ' Expr $T 2-$T 1 '
rbps= ' Expr $R 2-$R 1 '
tkbps= ' expr $TBPS/1024 '
rkbps= ' expr $RBPS/1024 '
echo "TX $: $TKBPS kb/s RX $: $RKBPS kb/s"
Done

Linux Script test network speed