Easier history usage

[Steven Harms]

Binary package hint: bash

https://wiki.ubuntu.com/Spec/EnhancedBash

Add helpful bash shortcuts that will help users better utilize their system. This will allow the user to see commands they typed, and give a reasonable history setting. Currently page-up and page-down scroll through history, but they don't match partially typed commands. There are other bindings for these, but this is by far the most intuitive system I have seen.

    * Bind pageup to history-search-backward
    * Bind pagedown to history-search-forward
    * Add shopt -s histappend
    * Add PROMPT_COMMAND='history -a'

What these do:

    * Bind pageup to history-search-backward
          o This will allow page-up to match previously typed commands from partial input
    * Bind pagedown to history-search-forward
          o This will allow page-down to match previously typed commands from partial input
    * Add shopt -s histappend
          o This will make bash append to the history file instead of overwrite it
    * Add PROMPT_COMMAND='history -a'
          o This will append the previous command to history each time a prompt is shown

[Ralph Janke (txwikinger)]

https://blueprints.edge.launchpad.net/ubuntu/+spec/bashimprovement