dd the following to ~/.bashrc
# Avoid duplicates export HISTCONTROL=ignoredups:erasedups # When the shell exits, append to the history file instead of overwriting it shopt -s histappend # After each command, append to the history file and reread it export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"