Save Bash History Realtime

I kind of get sick of my work computer dying, and then I lose some history because I forgot to exit my terminal sessions.  I’ve always used the histappend feature, but this prompt command thing is great. 😀  Thank you Stack Exchange.  The other benefit of this is that each terminal immediately receives the new history next time you press enter.

shopt -s histappend # append to history, don't overwrite it
export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"

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