> For the complete documentation index, see [llms.txt](https://docs.k9.io/key9-identity/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.k9.io/key9-identity/ssh/installation-and-setup/determine-your-yubikey-type/1.-linux-lsusb-command.md).

# 1. Linux "lsusb" command

Please make sure your YubiKey is connected to your Linux workstation and then open a Linux command line terminal and type: 

`$ lsusb | grep -i Yubikey` 

You should see something similar to this: 

<figure><img src="https://2354768316-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FZbcN0W0VyihswJIdHDaE%2Fuploads%2Ft3xFWsl5IHQnfJGM8dcn%2Fimage.png?alt=media&amp;token=fa28b12b-6fd3-4869-9625-bd28332d87cb" alt=""><figcaption><p>Output from "lsusb | grep -i Yubikey"</p></figcaption></figure>

This example involves two YubiKeys: one is an older version 1 or 2 YubiKey that does not support FIDO2, PIV, etc., and the other is a version 4 or 5 key that supports PIV, and possibly FIDO2.