Within the shell, typing ALT+. or using !$ recalls the last passed argument of the previous command. I use this all the time, but how do you do that when you detached the previous command? $ ...
When you delete characters on the command line using readline commands (e.g. Ctrl-U, you can paste using Ctrl-y, but where does it get stored? It does not seem to use X11 clipboard at all.
When I install php5-cli on Debian Wheezy (currently testing), the interactive prompt is very unusable due to missing readline support (bug 341868). What's the easiest way to install a version linked ...