Which of the following is a command line packet analyzer similar to GUI-based Wireshark?

Nessus is a vulnerability scanner used to identify security weaknesses on hosts and networks, not a packet capture or analysis tool.

'Jack the Ripper' is not a real tool; the correct name is 'John the Ripper,' which is a password-cracking tool, not a packet analyzer.

Tcpdump is a widely-used command-line network packet analyzer that captures live packet data from a network interface and displays it in the terminal, making it the CLI equivalent of Wireshark. It uses the libpcap library, the same underlying library that Wireshark uses, and supports the same pcap file format for saving and reading captures.

Ethereal was the former name of Wireshark before it was renamed in 2006; it is a GUI-based tool and is no longer actively developed or distributed under that name.