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7 Tips - Tuning Command Line History in Bash - ShellHacks
There's nothing here that isn't in the manual, but it's a concise reference that's all in one place. Every 'shopt' and 'HISTCONTROL' option listed here seems to be supported in Bash 4.1 and above (this means CentOS 6).

The 'PROMPT_COMMAND' example, though, would clobber an existing PROMPT_COMMAND, so do it like this instead:
<code class="language-bash">PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND; }history -a"</code>
bash  history  histfile  configfile  dotfile  essential  movein  reference 
july 2019 by kme
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