OpenDarwin 7.2.1 - man page for incr (opendarwin section n)

incr(n) 			      Tcl Built-In Commands				  incr(n)

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NAME
       incr - Increment the value of a variable

SYNOPSIS
       incr varName ?increment?
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DESCRIPTION
       Increments the value stored in the variable whose name is varName.  The value of the vari-
       able must be an integer.  If increment is supplied then its value (which must be an  inte-
       ger) is added to the value of variable varName;	otherwise 1 is added to varName.  The new
       value is stored as a decimal string in variable varName and also returned as result.

SEE ALSO
       expr(n)

KEYWORDS
       add, increment, variable, value

Tcl											  incr(n)