I am having a problem with the Debian package "checkpw", which I want to
investigate using a debugger.

Testing the checkpw interface, as root:

printf "markmailboxy123456"|checkpw id 3[&0

This should run the id program, but it does not.

I need to replicate the above behaviour in gdb, to find out where checkpw is
exiting.

You can study gdb by doing the command "info gdb".

I know this. I need some guidance, since the documentation is convoluted.

If you're going to be using gdb consistently, I recommend GNU Press's
book on GDB (www.gnupress.org).

In alt.comp.linux Linønut [=?iso-8859-1?Q?lin=F8nut?=@bone.com] wrote:

You can study gdb by doing the command "info gdb".

I know this.