public String[] getCommand() {
        return command;
    }
Checks to see if the command can be run. Typically used with
something like "myapp --version" to check to see if "myapp"
is installed and on the path.

@param checkCmd   The check command to run
@param errorValue What is considered an error value?
tika-core/src/main/java/org/apache/tika/parser/external/ExternalParser.java