Which command can a non-root user use to return the process ID listening on port 8080?

Which command can a non-root user use to return the process ID listening on port 8080?

• A. sudo netstat -an -p TCP | grep :8080
• B. sudo netstat -anp | grep :8080
• C. netstat -anp | grep :8080
• D. netstat -an -pid * | grep :8080

Answer: (B)

The command that allows a non-root user to return the process ID listening on port 8080 is structured as follows: it uses 'netstat' with options that provide network statistics, including active connections. The first part of the command, 'netstat -anp', displays all connections and listening ports (`-a`), prevents the resolution of hostnames (`-n`), and includes the corresponding process IDs (`-p`). In this context, the non-root user can execute this command effectively without requiring elevated permissions because the combination of the options allows access to the listing of listening processes along with their identifiers. The subsequent '| grep :8080' is employed to filter the output specifically for entries related to port 8080, which is essential for isolating the relevant information. The other options either include unnecessary 'sudo', which typically requires superuser privileges, or do not properly format the command to achieve the desired result, either omitting the necessary flags or not achieving the correct syntax to extract the process ID. Therefore, using the correct command structure as indicated ensures the non-root user can successfully retrieve the information.

The command that allows a non-root user to return the process ID listening on port 8080 is structured as follows: it uses 'netstat' with options that provide network statistics, including active connections. The first part of the command, 'netstat -anp', displays all connections and listening ports (-a), prevents the resolution of hostnames (-n), and includes the corresponding process IDs (-p).

In this context, the non-root user can execute this command effectively without requiring elevated permissions because the combination of the options allows access to the listing of listening processes along with their identifiers. The subsequent '| grep :8080' is employed to filter the output specifically for entries related to port 8080, which is essential for isolating the relevant information.

The other options either include unnecessary 'sudo', which typically requires superuser privileges, or do not properly format the command to achieve the desired result, either omitting the necessary flags or not achieving the correct syntax to extract the process ID. Therefore, using the correct command structure as indicated ensures the non-root user can successfully retrieve the information.