<p>The space only works if <code>HISTCONTROL</code> is set to <code>ignorespace</code>.  Instead of setting that you could set <code>ignoredup</code> or <code>erasedup</code>, see <a href="http://www.gnu.org/software/bash/manual/html_node/Bash-Variables.html#index-HISTCONTROL">here</a></p>

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