cite about-plugin
about-plugin 'improve history handling with sane defaults'

# append to bash_history if Terminal.app quits
shopt -s histappend

# erase duplicates; alternative option: export HISTCONTROL=ignoredups
export HISTCONTROL=${HISTCONTROL:-ignorespace:erasedups}

# resize history to 100x the default (500)
export HISTSIZE=${HISTSIZE:-50000}