liquibase-core/src/main/java/liquibase/integration/commandline/Main.java
private void parseDefaultPropertyFileFromFile(File potentialPropertyFile) throws IOException,
            CommandLineParsingException {
        try (FileInputStream stream = new FileInputStream(potentialPropertyFile)) {
            parsePropertiesFile(stream);
        }
    }
private void parseDefaultPropertyFileFromFile(File potentialPropertyFile) throws IOException,
            CommandLineParsingException {
        try (FileInputStream stream = new FileInputStream(potentialPropertyFile)) {
            parsePropertiesFile(stream);
        }
    }
Open a regular property file (not embedded in a resource - use {@link #parseDefaultPropertyFileFromResource}
for that) and parse it.

@param potentialPropertyFile path and file name to the the property file
@throws IOException                 if the file cannot be opened
@throws CommandLineParsingException if an error occurs during parsing