incr0
| Rivet Tcl Commands and Variables |

## Name

incr0 — increment a variable or set it to 1 if nonexistent.

## Synopsis

incr0 ?`varname`? ?`num`?

## Description

Increment a variable `varname` by `num`. If the variable doesn't exist, create it instead of returning an error.

| Note
incr0 functionality is provided by the native incr in Tcl >= 8.5, therefore this command is deprecated and kept as an interpreter alias only for compatibility. As such incr0 wasn't moved to the ::rivet namespace and it will be removed in future versions of Rivet.

include |  | inspect