# Command Line

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## Description

This document describes how to run checkstyle using the command line tool. The latest version of checkstyle can be found at http://checkstyle.sourceforge.net. This command line tool is included in the checkstyle distribution.

## Installation

The easiest way is to include checkstyle-all-4.2.jar in the classpath. If you are running JDK 1.4 this contains all the classes required to run checkstyle (JDK 1.3 users must add a JAXP compliant XML parser implementation). Alternatively, you must include the following in the classpath:

1. checkstyle-4.2.jar
2. ANTLR 2.7.2 classes. antlr.jar is included in the distribution.
3. Jakarta Commons Beanutils classes. commons-beanutils.jar is included in the distribution.
4. Jakarta Commons Collections classes. commons-collections.jar is included in the distribution.
5. Jakarta Commons Logging classes. commons-logging.jar is included in the distribution.
6. Jakarta Commons CLI (command line interface) classes. commons-cli.jar is included in the distribution.
7. JDK 1.3 only: A JAXP compliant XML parser implementation.

## Usage

The command line usage is:

    java -D<property>=<value>  \
         com.puppycrawl.tools.checkstyle.Main \
         -c <configurationFile> [-n <packageNameFile>] \
         [-f <format>] [-p <propertiesFile>] [-o <file>] \
         [-r <dir>] file...

Checkstyle will process the specified files and by default report errors to standard out in plain format. Checkstyle requires a configuration XML file that configures the checks to apply. Command line options are:

- -n packageNamesFile - specify a package names file to use.
- -f format - specify the output format. Options are "plain" for the DefaultLogger and "xml" for the XMLLogger. Defaults to "plain".
- -p propertiesFile - specify a properties file to use.
- -o file - specify the file to output to.
- -r dir - specify the directory to traverse for Java source files.

Set the properties for expanded property values by either by assigning system properties using the `-D<property>=<value>` arguments to java or specifying a property file using the `-p` option. If a property file is specified, the system properties are ignored.

## Examples

Run checkstyle with configuration file `docs/sun_checks.xml` on a file

    java com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         Check.java

Run checkstyle with configuration file `docs/sun_checks.xml` on all java files in a directory

    java com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         -r src/

Run checkstyle with configuration file `docs/sun_checks.xml` on a file and provide a system property

    java -Dcheckstyle.cache.file=target/cachefile \
         com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         Check.java

Run checkstyle with configuration file `docs/sun_checks.xml` on a file and use properties in a file

    java com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         -p myCheckstyle.properties Check.java

Run checkstyle with configuration file `docs/sun_checks.xml` on a file and output to a file in XML format

    java com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         -f xml -o build/checkstyle_errors.xml Check.java

Run checkstyle with configuration file `docs/sun_checks.xml` on a file and provide a package names file

    java com.puppycrawl.tools.checkstyle.Main -c docs/sun_checks.xml \
         -n myPackageNames.xml Check.java

#### Tip

It is possible to run Checkstyle directly from the JAR file using the -jar option. An example would be:

java -jar checkstyle-all-4.2.jar \ -c docs/sun_checks.xml Check.java
Copyright © 2001-2005, Oliver Burn