tcpdump
tcpdump is a Linux command in the Network category, rated intermediate difficulty. Packet analyzer — captures and displays network packets. The syntax is tcpdump [options] [expression]. It returns captured network packets. A close relative is ping, which tests network connectivity to a host by sending ICMP echo requests. A close relative is curl, which transfers data to/from a server using various protocols (HTTP, FTP, etc.). A close relative is wget, which downloads files from the internet. Supports recursive downloads. More about this category: Linux networking commands — ping, curl, wget, netstat, ss, ifconfig, and more. Configure and troubleshoot network connections. Related Network commands: ping, curl, wget, ifconfig, ip, ss, netstat, nslookup. This page is part of the free Linux Reference documentation covering 304+ commands, each with syntax, options, practical examples, and a difficulty rating. Find tcpdump and the other essentials on the Linux cheat sheet, or return to the Linux Reference homepage.