Make Arrow Keys work on AIX, HPUX, etc

    #
    # various hints for screen and command line editing
    #
    EDITOR=vi ; export EDITOR  #silently does a set -o vi
    VISUAL=vi ; export VISUAL  #silently does a set -o vi
    set -o emacs               #silently does a set -o emacs :-)

    #
    #  make arrow keys work by mapping the escape sequences the arrow keys send
    #    to the corresponding emacs-ish control characters.
    #  since these aliases are mapping keystrokes and not commands we need
    #    backticks (capture the *effect* of the command into the alias).
    #
    if uname -a |grep -qi -e ^aix -e ^hp ; then
        alias __A=`echo "\020"`  #ctrl-p => up
        alias __B=`echo "\016"`  #ctrl-n => down
        alias __C=`echo "\006"`  #ctrl-f => right
        alias __D=`echo "\002"`  #ctrl-b => left
    fi