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Google's authenticator
Google Authenticator is based on and implements the Time-based One-Time Password (TOTP) algorithm specified in RFC 6238. 6-digit code.
read image from file
zbarimg -q Screenshot.png QR-Code:otpauth://totp/Google%3Auser%40example.com?secret=base32secret&issuer=Google
generate QR from command line
qrencode -t ANSI256UTF8 'otpauth://totp/Google%3Auser%40example.com?secret=base32secret&issuer=Google'