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tldr/pages/linux/knock.md
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linux/*: add option placeholders (#16192)
* batch1

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* Update matchpathcon.md

* Update pages/linux/arecord.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/linux/arecord.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/linux/arecord.md

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

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Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
2025-04-19 21:21:53 +00:00

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# knock
> Port knocking client to open specific ports on firewall.
> More information: <https://manned.org/knock>.
- Knock on ports using different protocols:
`knock {{hostname}} {{portnumber}}:{{protocol}}`
- Knock on port using UDP:
`knock {{[-u|--udp]}} {{hostname}} {{portnumber}}`
- Force usage of IPv4/IPv6:
`knock {{-4|-6}} {{hostname}} {{portnumber}}`
- Display errors and details of connection:
`knock {{[-v|--verbose]}} {{hostname}} {{portnumber}}`