Christian Lynbech wrote:

For shell buffers, I have solved this problem by indentifying the shell modes filter function (defadvice term-emulate-terminal (after term-emulate-terminal-advice activate)

Interesting hook function, but did you know that comint provides M-x send-invisible to that effect? M-x send-invisible asks for the hidden text to be sent to the process, echos * instead in the echo area and does not keep input in the history (but still in C-h l aka. view-lossage). It works in comint, inf-lisp and all other modes that are based on comint (originally called cmushell/cmulisp.el by Olin Shivers around 1992). Of course, send-invisible does not work in slime either, so the problem still remains. Regards, Jorg Hohle.