Preserve bash history in multiple terminal windows

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    Add the following to your ~/.bashrc:    
# Avoid duplicates  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  PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"

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