% ck2yaml --help
usage: ck2yaml [-h] [-p] [-q] [-d] [--input INPUT] [--thermo THERMO] [--transport TRANSPORT]
               [--surface SURFACE] [--extra EXTRA] [--name NAME] [--single-intermediate-temperature]
               [--no-validate] [--output OUTPUT]

Convert Chemkin-format mechanisms to Cantera YAML input files

options:
  -h, --help            show this help message and exit
  -p, --permissive      This option allows certain recoverable parsing errors (for example, duplicate
                        thermo or transport data) to be ignored.
  -q, --quiet           Suppresses warning messages, such as those about duplicate thermo data.
  -d, --debug           Enables additional debugging output that may be helpful in identifying problems
                        in the input files or **ck2yaml** itself.
  --input INPUT         Chemkin-format chemistry input file, containing a list of all the element names
                        that are used, a list of all the species names, and a list of all the reactions
                        to be considered between the species. This file can also optionally contain
                        species THERMO and TRANSPORT data.
  --thermo THERMO       If the INPUT file does not contain THERMO data, a separate file containing
                        thermodynamic information must be specified. If no INPUT file is provided,
                        THERMO data are converted to a YAML file containing only species definitions
                        (which can be referenced from phase definitions in other input files).
  --transport TRANSPORT
                        If the INPUT file does not contain TRANSPORT data, a separate file containing
                        transport information may be specified. Transport data are required for Cantera
                        calculations that use transport properties such as one-dimensional flame
                        calculations; they are usually not required for zero-dimensional reactor
                        simulations.
  --surface SURFACE     For surface mechanisms, the SURFACE file defines surface species and reactions
                        occurring on the surface. Gas phase species and reactions should be defined in
                        the INPUT file.
  --extra EXTRA         This option specifies a YAML file which can be used to add to the
                        **description** field or to define custom fields that are included in the YAML
                        output.
  --name NAME           This specifies the name of the phase in the resulting YAML file. The default is
                        **gas**.
  --single-intermediate-temperature
                        This option should be used with thermo data where only a single break
                        temperature is used and the last value in the first line of each species thermo
                        entry is the molecular weight instead.
  --no-validate         Disables the validation step, where the YAML mechanism is imported in Cantera
                        to check for errors such as unlabeled duplicate reactions and discontinuous
                        thermodynamic data.
  --output OUTPUT       Specifies the OUTPUT file name. By default, the output file name is the input
                        file name with the extension changed to **.yaml**.

Example::

    ck2yaml --input=chem.inp --thermo=therm.dat --transport=tran.dat

If the **ck2yaml** script is not on your path but the Cantera Python module is,
**ck2yaml** can also be invoked by running::

    python -m cantera.ck2yaml --input=chem.inp --thermo=therm.dat --transport=tran.dat

In both cases, the equal sign in the options is optional.