Simple bash script for check network link status

This is simple bash script to check network interface link status we used a if else condition in this script. if network cable not plug shell script will echo disconnected else echo connected.


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Step 1:

install ethtool package

apt-get install ethtool 

Create a file in /usr/local/bin or any other location  with following script

vi  /usr/local/bin/status 

#!/bin/bash

# Bash script created by lokesh 

# For loop start

for status in eth0 eth1 wlan0 wlan1 wlan2 wlan3 

do

# if condition start

if [[ ! $( ethtool $status | grep -i "Link detected: yes" ) ]]; then

echo "$status Disconnected"

else

echo "$status Connected"

# if condition end

fi

# for loop end

done;

Explanation :

For loop : 

for status in eth0 eth1 wlan0 wlan1 wlan2 wlan3 

do

check interface step by step in loop, you can use your interface by replace all 

if else :

if [[ ! $( ethtool $status | grep -i "Link detected: yes" ) ]]; then

for check condition true or false

ethtool = command  

$status = loop variable

grep -i "Link detected: yes"  = grep ethtool outupt

Thanks