If it is successful then it will show as Connected or else Not Connected. We are using below nc command to scan for listening daemons on port 443(-z) without sending any data and specifying timeout to 1 sec using -w option. This feature can be effectively used to check internet connectivity in Linux. You can also scan for listening daemon on specific remote port without sending any data. If you have netcat or nc command available in your system then you can use this utility to establish TCP or UDP connections to a host port on internet. You can also use a shell script instead of above command to perform the same check using if else statement as shown below. wget -q -spider & echo "Connected" || echo "Not Connected" If it can successfully reach out to the page then it will show output as Connected otherwise as Not Connected. Here we are using -q option to suppress the output and -spider option to check the availability of page instead of downloading it. You can use below wget command to check and verify internet connectivity in your system. To know more about wget command, you can check what is wget and how to use wget command in Linux (20 Popular wget examples). You can also check internet connectivity in your system by trying to download a page or a file from internet by using a frequently used tool for this purpose called wget. if curl -s -head | grep "200 OK" > /dev/null then We can also use above command in the form of shell script using if else condition as shown below. curl -s -head | grep "200 OK" &> /dev/null & echo "Connected" || echo "Not Connected" But in case if it is not able to download headers then it will display as Not Connected. If it provides 200 OK response then your system is able to connect internet and hence it will display as Connected on output. In below example, we are silently (-s) fetching the headers(-head) of. To know more about curl command, you can check 20 Useful curl command in Linux with Examples | How to Use curl in Linux. Hence it can be effectively used for checking internet connectivity. By using curl to access a web page or a file over the internet, you can determine if your system is capable of establishing a connection to servers on Internet. if ping -c 1 &> /dev/null thenĬurl is a well known tool for retrieving data from a specified URL or server. ![]()
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