This is a tool that will tell you when the YubiKey is waiting for the user to touch it for authorization. Integrates with the UI to display the indicator.
The YubiKey may require a physical touch to confirm the following operations:
- sudo command (via pam-u2f)
- gpg --sign
- gpg --decrypt
- ssh to the remote host (and related commands like scp, rsync, etc.)
- ssh from one remote host to another (via ssh-agent)
Already integrated with this tool py3status и barista.
Source: linux.org.ru