Categories
Laptop linux Microsoft

Where is environment variables?

Every process has an environment block that contains a set of environment variables and their values. There are two types of environment variables: user environment variables (set for each user) and system environment variables (set for everyone). An environment variable is a dynamic-named value that can affect the way running processes will behave on a computer.

By default, a child process inherits the environment variables of its parent process. Programs started by the command processor inherit the command processor’s environment variables.

How to set or change the Environment Variables?

Windows

Environment Variables

Windows 10 and Windows 8
  1. In Search, search for and then select: System (Control Panel)
  2. Click the Advanced system settings link.
  3. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it. Click Edit. If the PATH environment variable does not exist, click New.
  4. In the Edit System Variable (or New System Variable) window, specify the value of the PATHenvironment variable. Click OK. Close all remaining windows by clicking OK.
  5. Reopen Command prompt window, and run your java code.
Windows 7
  1. From the desktop, right click the Computer icon.
  2. Choose Properties from the context menu.
  3. Click the Advanced system settings link.
  4. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it. Click Edit. If the PATH environment variable does not exist, click New.
  5. In the Edit System Variable (or New System Variable) window, specify the value of the PATHenvironment variable. Click OK. Close all remaining windows by clicking OK.
  6. Reopen Command prompt window, and run your java code.
Windows Vista
  1. From the desktop, right click the My Computer icon.
  2. Choose Properties from the context menu.
  3. Click the Advanced tab (Advanced system settings link in Vista).
  4. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it. Click Edit. If the PATH environment variable does not exist, click New.
  5. In the Edit System Variable (or New System Variable) window, specify the value of the PATHenvironment variable. Click OK. Close all remaining windows by clicking OK.
  6. Reopen Command prompt window, and run your java code.
Windows XP
  1. Select Start, select Control Panel. double click System, and select the Advanced tab.
  2. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it. Click Edit. If the PATH environment variable does not exist, click New.
  3. In the Edit System Variable (or New System Variable) window, specify the value of the PATHenvironment variable. Click OK. Close all remaining windows by clicking OK.
  4. Reopen Command prompt window, and run your java code.

Mac OS X

To run a different version of Java, either specify the full path, or use the java_home tool:

% /usr/libexec/java_home -v 1.8.0_73 --exec javac -version

Solaris and Linux

  1. To find out if the path is properly set:
    In a terminal windows, enter:
    % java -version
    This will print the version of the java tool, if it can find it. If the version is old or you get the error java: Command not found, then the path is not properly set.
  2. Determine which java executable is the first one found in your PATH
    In a terminal window, enter:
    % which java
Set the PATH permanently

To set the path permanently, set the path in your startup file.
Note: Instructions for two most popular Shells on Linux and Solaris are listed.

Bash Shell

Edit the startup file (~/.bashrc)

  1. Modify PATH variable
    PATH=/usr/local/jdk1.8.0/bin:$PATH
    export PATH
  2. Save and close the file
  3. Load the startup file
    % . /.profile
  4. Verify that the path is set by repeating the java command
    % java -version
C Shell (csh)

Edit the startup file (~/.cshrc)

  1. Set Path
    set path=(/usr/local/jdk1.8.0/bin $path)
  2. Save and close the file
  3. Load the startup file
    % source ~/.cshrc
  4. Verify that the path is set by repeating the java command
    % java -version

 

'Coz sharing is caring

By Swatantra Kumar

Swatantra is an engineering leader with a successful record in building, nurturing, managing, and leading a multi-disciplinary, diverse, and distributed team of engineers and managers developing and delivering solutions. Professionally, he oversees solution design-development-delivery, cloud transition, IT strategies, technical and organizational leadership, TOM, IT governance, digital transformation, Innovation, stakeholder management, management consulting, and technology vision & strategy. When he's not working, he enjoys reading about and working with new technologies, and trying to get his friends to make the move to new web trends. He has written, co-written, and published many articles in international journals, on various domains/topics including Open Source, Networks, Low-Code, Mobile Technologies, and Business Intelligence. He made a proposal for an information management system at the University level during his graduation days.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.