Feisty's /etc/skel.bashrc seems to contain
# don't put duplicate lines in the history. See bash(1) for more options
export HISTCONTROL=ignoredups
# ... and ignore same sucessive entries.
export HISTCONTROL=ignoreboth

ignoredups export wasn't there when Dapper was released, because that's
when I last time updated my bash scripts from /etc/skel and I didn't
have it either.

-- 
mc: each action pollutes .bash_history
https://launchpad.net/bugs/53095

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