Bash History per iTerm Tab/Session

gistfile1.txt

# Unique history file per shell session.
export HISTSIZE=1000
export HISTFILE=~/.bash-history-${ITERM_SESSION_ID}
# export HISTFILE=$HOME/.bash_hist_${HOSTNAME/.*/}_$(basename $(tty))
export SAVEHIST=1000
# New - remove if not working properly
export HISTCONTROL=ignoreboth
# export HISTCONTROL=ignoredups

# For iTerm2 to show the directory it's in
if [ $ITERM_SESSION_ID ]; then
  export PROMPT_COMMAND='echo -ne "\033];${PWD##*/}\007"; ':"$PROMPT_COMMAND";
fi