## SYNOPSIS

**unitconv**[

*unit*]

*value*

**unitconv**[

*unit*]

*expression*

## DESCRIPTION

**unitconv**is a simple energy and length units converter (written in Tcl). It is a utility program of

**xcrysden**package (

*http://www.xcrysden.org/*).

## ENERGY UNITS

The following **energy units** are supported. The following list
contain the "*unit* -- description" pairs, where the *unit* is to
be specified on the command line.

**au**-- Hartree**ry**-- Rydberg**ev**-- eV (electron volt)**kjm**-- kJ/mol**kj**-- kJ**kcalm**-- kcal/mol**kcal**-- kcal-

## LENGTH UNITS

The following **length units** are supported (usage as above):

**angs**-- Angstrom**bohr**-- Bohr radius**m**-- meter-

## EXAMPLES

Convert a value from eV to other energy units:

**unitconv ev 3.25**

Calculate an expression (values in Rydberg unit) and convert to other energy units (note that expression must be quoted):

**unitconv ry "-103.134567 - (-240.691356 - -2*17.543471)/2"**

In expression also mathematical functions available in **tclsh** can be
used.

## COPYRIGHT

Copyright (C) 1996--2012 Anton Kokalj

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.