Commands for viewing, adding, and configuring environment variables under Linux
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
