ngrep:tldr:a960f

ngrep: Filter keyword 'User-Agent:' of interface eth0.

ngrep

$ ngrep -d ${eth0} '${User-Agent:}'

try on your machine

The command "ngrep -d ${eth0} '${User-Agent:}'" is using the ngrep tool to capture network traffic on a specific network interface (eth0) and filter it based on the presence of the User-Agent field in the packets.

Here's a breakdown of the command:

"ngrep": This is the name of the tool being executed.
"-d ${eth0}": This option specifies the network interface to listen on. In this case, it is set to ${eth0}, which suggests that the value is expected to be provided as an environment variable.
"'${User-Agent:}'": This is the filter or pattern to match in the captured traffic. The User-Agent field is a standard HTTP header that provides information about the client application making the request. In this case, the filter matches any packet that contains the User-Agent field, regardless of its value.

Overall, the command is used to capture and display network traffic that contains the User-Agent field, providing visibility into the types of client applications communicating over the specified network interface.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

back to the ngrep tool