Shell Script : Check Ping To Remote Host And Port Opened

This shell script enables you to perform a ping to remote host and check whether the mentioned port is opened on that server. This helps system admin for ping test and also make sure if there any issues with specific ports.

Shell Script

Test Ping And Open Port

#!/bin/bash

# check if service name passed to script as argument, if there no arguments (0) do next

if [ "$#" = "0" ];

then

#write to terminal usage

echo “Usage: $0 ”

#since no arguments – we need to exit script and user re-run

exit 1
fi

#writing parameters to variables

host=$1
port=$2
email=”test@expertslogin.com”
subject=”Script result”

#Check if ping ok -q to quite mod, -c 4 for 4 checks

if ping -q -c 4 $host >/dev/null
then
# next lines writes result variable

ping_result=”OK”
else
ping_result=”NOT OK”

fi #end of fi loop

#next command check if port opened via nc command, and getting exit status of nc command

nc_result=`nc -z $host $port; echo $?`

#check of exit status of nc command, and write results to variables

if [ $nc_result != 0 ];
then
port_result=”not opened”
else
port_result=”opened”
fi #exit of fi loop

#writing message that script will email and write to output

message=”Ping to host – ${ping_result}, port $port ${port_result}.”

#next check if ping or port check is failed (ping if not OK and exit status of nc if not 0)

if [ "$ping_result" != "OK" -o "$nc_result" != "0" ];
then
echo “$message” #this line write warning message to terminal

echo “$message” | mail -s “$subject” $email #this line send email

fi