How to add environment variables in linux

The first method: (valid temporarily, invalid after restarting)

export PATH=/usr/local/webserver/mysql/bin:$PATH

The second method: (valid permanently)

Edit /etc/profile file:

vim /etc/profile

Add the following configuration at the end of the file:

export JAVA_HOME=/usr/local/jdk-12/
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

The source command reloads the /etc/profile file so that the modified content is valid in the current shell window:

source /etc/profile

What versions of Linux are there?

Linux versions include: Deepin, UbuntuKylin, Manjaro, LinuxMint, Ubuntu and other versions. Among them, Deepin is one of the best-developed Linux distributions in China; Ubuntu Kylin is a derivative distribution based on Ubuntu; Manjaro is a Linux distribution based on Arch; LinuxMint's default Cinnamon desktop is similar to Windows XP and is simple and easy to use; Ubuntu is a desktop application Mainly Linux operating system.

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