Shulou(Shulou.com)06/03 Report--

This article introduces the knowledge of "commands to view, add and configure environment variables under Linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. You can view the path value with the export command

[root@localhost u-boot-sh5] # export can view all variables

two。 To view the PATH environment variables separately, you can:

[root@localhost u-boot-sh5] # echo $PATH

3. Add PATH environment variable (temporary), available:

[root@localhost u-boot-sh5] # export PATH=/opt/STM/STLinux-2.3/devkit/sh5/bin:$PATH

4. Permanently add environment variables (affecting the current user)

# vim ~ / .bashrc

Export PATH= "/ opt/STM/STLinux-2.3/devkit/sh5/bin:$PATH"

5. Permanently add environment variables (affecting all users)

# vim / etc/profile

At the end of the document, add:

Export PATH= "/ opt/STM/STLinux-2.3/devkit/sh5/bin:$PATH"

Save, exit, and then run:

# source / etc/profile

Ag:

Java use yum installation do not know where the installation path, want to configure the environment variable how to operate?

View the java installation path

View and use: set java_home under windows

View and use: whereis java under linux

The following is how I view linux

Java: / usr/bin/java / etc/java / usr/lib/java / usr/share/java / usr/share/man/man1/java.1.gz

Usually the first / usr/bin/java = > this is a file, according to which you can find the final installation directory

My final installation directory is / usr/lib/jvm/java

Configure the environment variables after finding the installation directory

Here are the environment variables that configure linux: (remember source .bash _ profile) vi this file / etc/profileexport JAVA_HOME=/usr/lib/jvm/javaexport CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

Add at the end of the .bash _ profile file: export PATH=$JAVA_HOME/bin:$PATH.shell terminal executes the following command: (temporary) export PATH=$JAVA_HOME/bin:$PATH

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