histappend is a must for me for any decent bash history usage; I like to set HISTCONTROL=ignoredups along with it to keep things clean and I increased HISTSIZE and HISTFILESIZE from the defaults.
A good bash history can often save your behind when trying to reconstruct what you did or when you have to run that one magic command you last ran 5 months ago...
A good bash history can often save your behind when trying to reconstruct what you did or when you have to run that one magic command you last ran 5 months ago...