Linux Classroom Series – 21/Jul/2020

Setting Environmental Variable Path

• Lets try to install software terraform which is used by user ironman
• Lets try to install software packer which is used by user thor
• Lets try to install software java 8 which should be used by both the user
• After downloading terraform, unable to run command
• So lets add the folder of terraform to the path using export command
• Now i will logout of ironman, login & recheck & this fails
• So let create a file

echo 'export PATH=$PATH:/home/ironman/bin' > ~/.bash_profile

• Now logout & relogin & execute

printenv PATH
terraform --version

• Now lets do the samething for packer for thor

echo 'export PATH=$PATH:/home/thor/bin' > ~/.bash_profile
exit
# relogin
packer --version

• Packer can be downloaded from here & Terraform from here
• Now lets install Java 8

sudo apt-get install openjdk-8-jdk -y

• Java can be used by all the users as java executable is added to folder which is in path for all the linux users.
• Now lets assume on the same machine ironman wants java 11 & all other users want java 8

sudo apt-get install openjdk-11-jdk -y

• All the users got JAVA 11, now how to solve this problem. If use ENVIRONMENTAL variable called as JAVA_HOME, the problem can be solved
  • Add the following lines to /etc/profile

  export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
  export PATH=$JAVA_HOME/bin:$PATH
  

  • Add the following lines to /home/ironman/.bash_profile

  export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
  export PATH=$JAVA_HOME/bin:$PATH