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<TITLE>Exim Filter Specification - The add command</TITLE>
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<H2><A NAME="SEC12" HREF="filter_toc.html#TOC12">The add command</A></H2>
<PRE>
add <<EM>number</EM>> to <<EM>user variable</EM>>
e.g. add 2 to n3
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<P>
There are 10 user variables of this type, and their values can be obtained by
the normal expansion syntax (for example $<EM>n3</EM>) in other commands. At the
start of filtering, these variables all contain zero. Both arguments of the
<EM>add</EM> command are expanded before use, making it possible to add variables to
each other. Subtraction can be obtained by adding negative numbers.
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