htop, iftop, ngrep, tcpdump, lsof, strace, wireshark, nc, telnet, ping, netstat, ps, grep, awk, pv, middleman, curl, jq, mitmproxy, tail, tr.... Okay, ok prett

htop, iftop, ngrep, tcpdump, lsof, strace, wireshark, nc, telnet, ping, netstat, ps, grep, awk, pv, middleman, curl, jq, mitmproxy, tail, tr.... Okay, ok pretty much all of them. :)