This is a command line version of the Google Authenticator App. It will read the secrets file at $HOME/.twofactor and print out the codes and time to expire
The secrets file is in following format:
Label1:SECRET_KEY
Label2:ANOTHER_SECRET_KEY
Run go install to build and install.
Clock skew: If your clock is off, it may not generate the correct codes. Use
twofactor 2+ to generate codes one minute in the future (the clock is slow), or
twofactor 2- to generate codes one minute in the past (the clock is fast).