“ mvn -version”不返回版本

Question

I am trying to install maven on Ubuntu using the following steps :

1. user$ wget http://archive.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
2. user$ tar -zxvf apache-maven-3.3.9-bin.tar.gz
3. user$ export PATH=/usr/local/apache-maven-3.3.9/bin:$PATH

on doing
user$ echo $PATH

cli returns : /usr/local/apachemaven3.3.9/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

but on executing

user$ mvn -version

cli returns : The program 'mvn' can be found in the following packages:

• maven
• maven2

Try: sudo apt-get install

Is any step missing here ?

JAVA_HOME is already set :

user$ echo $JAVA_HOME

/usr/lib/jvm/java-8-oracle

Answer 1

In your path, you have /usr/local/apachemaven3.3.9/bin instead of /usr/local/apache-maven-3.3.9/bin .

Also I recommand you use an environment variable like MAVEN_HOME to save the location of Maven directory : /usr/local/apache-maven-3.3.9 .

Then you can set your PATH to ${MAVEN_HOME}/bin:${PATH} .

That way you won't have to change your PATH if you have to change your Maven directory or version for example. You only have to change your MAVEN_HOME .

Answer 2

You should set your environment variables in:

1. /etc/environment
2. /etc/profile

You can do it using the vi editor, and you'll need to it as super user. Like this:

sudo vi /etc/environment

Afterwards, restart your system or logout and log back in.