Commands are not distinguished from options except for the fact that only one command is allowed.
Print the program version and licensing information. Note that you cannot abbreviate this command.
Print a usage message summarizing the most useful command-line options. Note that you cannot abbreviate this command.
Print a list of all available options and commands. Note that you cannot abbreviate this command.
Run in server mode and wait for commands on the
default mode is to create a socket and listen for commands there.
--daemon [command line]
Start the gpg-agent as a daemon; that is, detach it from the console and run it in the background.
As an alternative you may create a new process as a child of
gpg-agent --daemon /bin/sh. This way you get a new
shell with the environment setup properly; after you exit from this
shell, gpg-agent terminates within a few seconds.