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Shell Scripting Sourcing a file

A file is sourced in two ways. One is either writting as source <fileName> or other is writting as . ./<filename> in the command line. When a file is sourced, the code lines are executed as if they were printed on the command line.

The difference between sourcing and executing a script is that, while executing a script it runs in a new shell whereas while sourcing a script, file will be read and executed in the same shell.

In sourcing, script content is displayed in the same shell but while executing script run in a different shell.

Look at the above snapshot, we have sourced the file var with one of the method.

Look at the above snapshot, we have sourced the file var with another method.