redhat man page for incr

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

__________________________________________________________________________________________________________________________________________________

NAME
       incr - Increment the value of a variable

SYNOPSIS
       incr varName ?increment?
_________________________________________________________________

DESCRIPTION
       Increments the value stored in the variable whose name is varName.  The value of the variable must be an integer.  If increment is supplied
       then its value (which must be an integer) 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)