Checking Maven Version

Solution 1:

Shorter

mvn -v

or

mvn --version

Output:

Apache Maven 3.0.5 (...)
Maven home: ...
Java version: 1.8.0_60, vendor: Oracle Corporation
Java home: ...
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos"

The other command (mvn -version) works because it starts with mvn -v.
You can also try mvn -v123 and you'll get the same output.

Details:

mvn -h

or

mvn --help

Output:

...
-V,--show-version                      Display version information
                                       WITHOUT stopping build
-v,--version                           Display version information

Command is not recognized

Probably you are in one of the following 2 situations:

1. You didn't add the Maven to the Path
   (run ECHO.%PATH:;= & ECHO.% in cmd to see if you are in this situation).
   • go to Control Panel\User Accounts\User Accounts
     (or click on your photo from the start menu)
   • click Change my environment variables
   • click on New... and add:
     • M2_HOME=<your_path>
     • MAVEN_HOME=%M2_HOME%
     • MAVEN_BIN=%M2_HOME%\bin
   • click on Edit... and add the ;%MAVEN_BIN% at the end of the Path
2. You added it to the Path, but you didn't open a new command prompt.
   • open a new command prompt, because the environment variables are not updated automatically

Solution 2:

Type the command mvn -version directly in your maven directory, you probably haven't added it to your PATH. Here are explained details of how to add maven to your PATH variable (I guess you use Windows because you are talking about CMD).

Solution 3:

Step 1: Start button -> Computer menu item -> Properties on right click menu item -> Advanced System Settings button on left panel -> Advanced tab in System Properties dialog -> Environment Variables button -> System variables table

Step 2: Add MAVEN_HOME variable

Step 3: Update PATH variable

Step 4: Make sure you have JAVA_HOME variable correctly

step 5: open console and check below command

mvn -v