How to enable bash history?

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Dec 25, 2016, 4:27:52 AM12/25/16

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In principle, everything looks ok:

# set -o | grep history

history on

# echo $HISTFILE

/root/.bash_history

# echo $HISTSIZE

500

# echo $HISTFILESIZE

500

But .bash_history is empty and the history is lost between sessions.

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Dec 25, 2016, 4:34:18 AM12/25/16

to BeagleBoard

Add to .bashrc

PROMPT_COMMAND="history -a"

shopt -s histappend

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