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Use the prompt to synchronize history between shells
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| shopt -s histappend | |
| HISTTIMEFORMAT="%s " | |
| ETERNAL_HISTORY_FILE="$HOME/.bash_eternal_history" | |
| PROMPT_COMMAND="history -a; history -n; $PROMPT_COMMAND" | |
| PROMPT_COMMAND='echo "$$" "$USER" "$(history 1)" >> "$(eval '"'"'echo $ETERNAL_HISTORY_FILE'"'"')"; '"${PROMPT_COMMAND}" |
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