“terminal is not fully functional” over ssh in a *shell* buffer

Question

I'm using the shell (M-x shell) to connect to a remote host via SSH. After launching some command line tools (mostly psql, the postgresql command line interface, but man would be the same for example), the shell is giving me the following warning:

WARNING: terminal is not fully functional                                                    
-  (press RETURN) 

As far as I know, this looks like a pager problem. Changing the pager to cat in my .emacs file:

(setenv "PAGER" "/bin/cat")

helped me get rid of those messages, but only for local commands (and I do not mind using cat as a pager). As I only have one local instance of Emacs, is there a way to use a different pager on the remote host? Or any other way to get rid of the warning messages, if possible without switching to ansi-term? If it's of any help, I'm using GNU Emacs 24.3.1.

Answer 1

The "problem" is that with M-x shell (or M-x eshell btw), Emacs uses a very limited terminal emulator, so that TERM is correctly set to dumb

Fancy pagers cannot operate under such limited constraints, which is why you have to use cat instead. Now, when you open an ssh connection from that shell, TERM is still dumb, but PAGER is reset to whatever the other system thinks you should use. In order to fix this, you need to alter your shell configuration on the remote system so that it uses decent defaults whenever it's accessed from a dumb terminal.

Something like:

[ "$TERM" = "dumb" ] && export PAGER=/bin/cat