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Program: How to get process environment variables in java at runtime?


The ProcessBuilder.environment() method returns you the ProcessBuilder's environemnt. Below example shows how to read it.

package com.java2novice.processbuilder;

import java.util.Map;
import java.util.Set;

public class MyEnvDetails {

	public static void main(String a[]){
		ProcessBuilder pb = new ProcessBuilder();
		Map<String, String> envMap = pb.environment();
		Set<String> keys = envMap.keySet();
		for(String key:keys){
			System.out.println(key+" ==> "+envMap.get(key));

SHELL ==> /bin/bash
JAVA_MAIN_CLASS_37131 ==> com.java2novice.processbuilder.MyEnvDetails
APP_ICON_385 ==> ../Resources/Eclipse.icns ==> client
TMPDIR ==> /var/folders/2n/yf7x2fdx3bv6g31hn4stv1y0_qsrzm/T/
__CF_USER_TEXT_ENCODING ==> 0x157CE3F4:0:0
PATH ==> /usr/bin:/bin:/usr/sbin:/sbin
COMMAND_MODE ==> unix2003
DISPLAY ==> /tmp/launch-DwnV41/org.x:0
USER ==> root ==>
Apple_Ubiquity_Message ==> /tmp/launch-u3pr6e/Apple_Ubiquity_Message
LOGNAME ==> root
Apple_PubSub_Socket_Render ==> /tmp/launch-nboOhX/Render
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List Of All ProcessBuilder Class Sample Programs:

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  2. How to run operating system specific command and read its output?
  3. How to get process environment variables in java at runtime?
  4. How to run ProcessBuilder with list of commands?
Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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