@Field
    public void setCommandLine(List<String> commandLine) {
        this.commandLine = commandLine;
    }
Use this to specify the full commandLine.  The commandline must
include at least {@link ExternalParser#INPUT_FILE_TOKEN}.
If the external process writes to an output file, specify
{@link ExternalParser#OUTPUT_FILE_TOKEN}.

@param commandLine
tika-core/src/main/java/org/apache/tika/parser/external2/ExternalParser.java