historysize get number of lines in history

## Syntax

                nb = historysize()
                nbMax = historysize("max")
                nbMax = historysize(newMax)

## Arguments

nb

  number of lines in current history.

nbMax

  number of lines maximum in history file.

newMax

  set number of lines maximum in history file.

  by default this value is 20000 lines max.

## Description

get number of lines in history.

This function can also used to set maximum number of lines in history file.

## Examples

    historysize()
                historysize("max")