What is the command of source in Linux?

Command usage:

SOURCE FileName

Function: Reads and executes the commands in the filename under the current bash environment.

Note: This command usually uses the command "." To replace.

such as:source/etc/profile and . The/etc/profile is equivalent.

Note: The difference between the source command and the shell scripts is:

Source executes the command in the current bash environment, and scripts starts a child shell to execute the command. This way, if the command to set the environment variable (or alias, etc.) is written into scripts, it will only affect the child shell and cannot change the current bash, so use the source command when setting the environment variable through the file (command column).

Examples of applications: Installing and configuring JDK and Tomcat under Linux

What is the command of source in Linux?