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\addtolength

\addtolength{len-cmd}{len}

The \addtolength command increments a length command, len-cmd, which is specified by the first argument, by the amount specified in the len argument. It can be a negative amount.

As an example,

  \addtolength{\parskip}{-.1\parskip}
decreases the value of \parskip by 10%.
See Lengths
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Revised: Sheldon Green, 9 May 1995.