$((...)) and $[...] comparison


 
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Old 12-21-2009
Quote:
Does $((mathematical expression)) and $[mathematical expression] mean the same?
A minor nitpick. $((...)) does not necessarily imply a mathematical expression. The following is perfectly valid
Code:
echo $((echo hi);(echo there))

This example is included in the IEEE 1003.1-2008 rationale.
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unitconv(1)							     XCrySDen							       unitconv(1)

NAME
unitconv - simple energy and length units converter 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.xcrys- den.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 MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. XCrySDen March 9, 2012 unitconv(1)