Linux Add system Environment variables

when installing and using the software under Linux, it is usually only possible to use the software command in the Software installation directory (except with the Yum command), which is cumbersome and we want to use it globally to add the software installation path to the system environment variable. There are 2 ways to add an environment variable://1, use the Export commandExport path= $PATH:/OPT/SOFTWARE/NODE-V8.9.3-linux-x64/bin/node//export using the export path= $PATH: Path 1: Path 2: path N, $PATH as a system variable, representing the path of all previous settings, if not plus all paths are invalidated. So it must be added. //2. Modify the configuration file/etc/profilevi/etc/Profile added in: Export PATH= $PATH:/opt/software/node-v8.9.3-linux-x64/bin/node//if you modify. Bash_profile in the user's home directory, the added environment variable is only valid for that user, and modifying the/etc/profile takes effect for all users. You can also modify the/etc/rc.local file and the/ROOT/.BASHRC file.
Modifying the configuration file may require restarting the machine to take effect

Linux Add system Environment variables