lesspipe.sh doesn't currently handle *.tbz, a small enhancement... oh, and maybe
*.arj -> unarj and *.lzh,*.lha -> lha (but possibly using the following
suggested enhancement).

But a bigger enhancement would be to implement pluggable handlers into
lesspipe.sh, say if I install unrar, I'd like less to read *.rar archives.  It'd
be nice if there was let's say /etc/lesspipe.d/ for small shell scripts that one
could just drop new handlers into.  The following patch works for me, but may
need some refining.  Following the patch is a source for /etc/lesspipe.d/rar
that adds the *.rar -> unrar functionality.  Please consider implementing this!

--- lesspipe.sh~        2002-06-23 22:50:27.000000000 +0300
+++ lesspipe.sh 2003-01-13 01:24:25.000000000 +0200
@@ -22,13 +22,16 @@
        fi ;;
   *.tar) tar tvvf "$1" ;;
   *.tgz|*.tar.gz|*.tar.[zZ]) tar tzvvf "$1" ;;
-  *.tar.bz2|*.tbz2) bzip2 -dc "$1" | tar tvvf - ;;
+  *.tar.bz2|*.tbz2|*.tbz) bzip2 -dc "$1" | tar tvvf - ;;
   *.[zZ]|*.gz) gzip -dc -- "$1" ;;
   *.bz2) bzip2 -dc -- "$1" ;;
   *.zip) zipinfo -- "$1" ;;
   *.rpm) rpm -qpivl --changelog -- "$1" ;;
   *.cpi|*.cpio) cpio -itv < "$1" ;;
   esac
+  for script in /etc/lesspipe.d/*; do
+    sh "$script" "$1"
+  done
 }


----- source for /etc/lesspipe.d/rar -----

#!/bin/sh -

case "$1" in
    *.rar) unrar l -p- "$1" ;;
esac