Normally, if sudo requires a password, it will read it from the

                 user's terminal.  If the -A (askpass) option is specified, a

                 (possibly graphical) helper program is executed to read the

                 user's password and output the password to the standard output.

                 If the SUDO_ASKPASS environment variable is set, it specifies

                 the path to the helper program.  Otherwise, if sudo.conf(5) con‐

                 tains a line specifying the askpass program, that value will be

                 used.  For example:

                     # Path to askpass helper program

                     Path askpass /usr/X11R6/bin/ssh-askpass

                 If no askpass program is available, sudo will exit with an

                 error.