These are all symbokic links to a sumple wrapper script that uses
run_init to run actually run the corresponding program after setting up the
proper context.
run_init acquires a new Psuedo terminal, forks a child process that binds to
the psueado terminal, forks the program
(dpkg, apt-get, aptitude, synaptic, dselect, or dpkg-reconfigure) that the user actually needs to run, and then sits around and connects
the physical terminal it was invoked upon with the psuedo terminal,
passing keyboard into to the child process, and passing the output of
the child process to the physical terminal.
It sets up the psuedo terminal properly based on the physical terminal
attributes, and then sets the user's terminal to RAW mode, taking care
to reset it on exit.
AUTHOR
This manual page was written by Manoj Srivastava <srivasta@debian.org>,
for the Debian GNU/Linux system.