tldr/pages/common/ngrep.md

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# ngrep
> Filter network traffic packets using regular expressions.
- Capture traffic of all interfaces:
`ngrep -d any`
- Capture traffic of a specific interface:
`ngrep -d {{eth0}}`
- Capture traffic crossing port 22 of interface eth0:
`ngrep -d {{eth0}} port {{22}}`
- Capture traffic from or to a host:
`ngrep host {{www.example.com}}`
- Filter keyword 'User-Agent:' of interface eth0:
`ngrep -d {{eth0}} '{{User-Agent:}}'`