diffpar
=======
FLASH runtime parameter files - often called ``flash.par`` - are key-value stores.  While
the :ref:`Python API provides functions <rp_lang>` for manipulating these files, the 
``flmake diffpar`` command exposes a tool for displaying the difference between two 
existing parameter files.  This is useful in diagnosing what is changed between separate
FLASH runs.

**USAGE**:: 

    flmake diffpar <parfile1> <parfile2>

examples
--------
Sample diff for similar runtime parameter files::

    Parameters with different values:
    ---------------------------------
    dtmax: 1e-07 != 3e-09
    ed_lensY: [-7.0] != [-4.0]
    lrefine_max: 11 != 10
    lrefine_min_init: 6 != 5
    plotFileIntervalTime: 1e-09 != 2.5e-10
    sim_rhoCham: 8e-07 != 1.6e-06
    tmax: 5e-06 != 2e-06
    xmax: 6.0 != 3.0
    ymax: 6.0 != 3.0
    ymin: -6.0 != -3.0

    Parameters only in parfile1:
    ----------------------------
    gr_hypreFloor: 5e-07

    Parameters only in parfile2:
    ----------------------------
    gr_hypreRelTol: 2e-07