HISTFILESIZE=400000000
HISTSIZE=10000
PROMPT_COMMAND="history -a"
export HISTSIZE PROMPT_COMMAND

shopt -s histappend

# backup history/warn about deleted history
if (( $(wc -l < ~/.bash_history) < 5000 ))
then
    echo "#########################"
    echo ".bash_history was cleared"
    echo "#########################"
else
    cp ~/.bash_history ~/.bash_history.back
fi