# avoid duplicates..
export HISTCONTROL=ignoredups:erasedups
# append history entries..
shopt -s histappend
# After each command, save and reload history
export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"
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It's generally safer to add things to the end of the prompt command than the beginning. Other commands in PROMPT_COMMAND won't be added to the history, but any command that uses $? needs to be at the front of PROMPT_COMMAND (for instance Powerline).
Pablo R.
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