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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH incr n "" Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-incr \- Increment the value of a variable
-.SH SYNOPSIS
-\fBincr \fIvarName \fR?\fIincrement\fR?
-.BE
-.SH DESCRIPTION
-.PP
-Increments the value stored in the variable whose name is \fIvarName\fR.
-The value of the variable must be an integer.
-If \fIincrement\fR is supplied then its value (which must be an
-integer) is added to the value of variable \fIvarName\fR;  otherwise
-1 is added to \fIvarName\fR.
-The new value is stored as a decimal string in variable \fIvarName\fR
-and also returned as result.
-.PP
-Starting with the Tcl 8.5 release, the variable \fIvarName\fR passed
-to \fBincr\fR may be unset, and in that case, it will be set to
-the value \fIincrement\fR or to the default increment value of \fB1\fR.
-.SH EXAMPLES
-.PP
-Add one to the contents of the variable \fIx\fR:
-.PP
-.CS
-\fBincr\fR x
-.CE
-.PP
-Add 42 to the contents of the variable \fIx\fR:
-.PP
-.CS
-\fBincr\fR x 42
-.CE
-.PP
-Add the contents of the variable \fIy\fR to the contents of the
-variable \fIx\fR:
-.PP
-.CS
-\fBincr\fR x $y
-.CE
-.PP
-Add nothing at all to the variable \fIx\fR (often useful for checking
-whether an argument to a procedure is actually integral and generating
-an error if it is not):
-.PP
-.CS
-\fBincr\fR x 0
-.CE
-.SH "SEE ALSO"
-expr(n), set(n)
-.SH KEYWORDS
-add, increment, variable, value