how to use #totp on linux judt use oath-toolkit like this $ oathtool --base32 --totp '#### #### #### ####' if you wanna store the code in a txt.file $ oathtool --base32 --totp '@filename' but it's better to encript the file with Gnupg, after encrypting it, use the command $ gpg -d -q filename.gpg | oathtool --base32 --totp - now can use your linux PC instead of google/windows #authenticator