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tmux-ressurect no longer restores shell history for each pane, as of [this PR](https://github.com/tmux-plugins/tmux-resurrect/pull/308).
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As a workaround, you can use the `HISTFILE` environment variable to preserve history for each pane separately, and modify
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`PROMPT_COMMAND` to make sure history gets saved with each new command.
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Unfortunately, we haven't found a perfect way of getting a unique identifier for each pane, as the `TMUX_PANE` variable
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seems to occasionally change when resurrecting. As a workaround, the example below sets a unique ID in each pane's `title`.
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The downside of this implementation is that pane titles must all be unique across sessions/windows, and also must use the `pane_id_prefix`.
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Any improvements/suggestions for getting a unique, persistent ID for each pane are welcome!
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```bash
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pane_id_prefix="resurrect_"
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# Create history directory if it doesn't exist
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HISTS_DIR=$HOME/.bash_history.d
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mkdir -p "${HISTS_DIR}"
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if [ -n "${TMUX_PANE}" ]; then
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# Check if we've already set this pane title
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pane_id=$(tmux display-message -p '#{pane_title}')
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if [[ $pane_id != "$pane_id_prefix"* ]]; then
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# if not, set it to a random ID
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random_id=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)
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printf "\033]2;$pane_id_prefix$random_id\033\\"
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pane_id=$(tmux display-message -p '#{pane_title}')
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fi
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# use the pane's random ID for the HISTFILE
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export HISTFILE="${HISTS_DIR}/bash_history_tmux_${pane_id}"
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else
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export HISTFILE="${HISTS_DIR}/bash_history_no_tmux"
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fi
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# Stash the new history each time a command runs.
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export PROMPT_COMMAND="$PROMPT_COMMAND;history -a"
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```
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