ngrep with an appropriate BPF filter syntax, can be used to debug plain text protocols interactions like HTTP, SMTP, FTP, DNS, among others, or to search for a specific string or pattern, using a grep regular expression syntax.[4][5]ngrep also can be used to capture traffic on the wire and store pcap dump files, or to read files generated by other sniffer applications, like tcpdump, or wireshark.ngrep has various options or command line arguments. The ngrep man page in UNIX-like operating systems show a list of available options.
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