ReoCLIK - Difference between "execute" a script and "source" a script - UNIX tips

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• Computer science > UNIX tips > Difference between "execute" a script and "source" a script

Difference between "execute" a script and "source" a script

To launch a script and run it line by line, you have to either source it or execute it: Different ways to run a script.

Sourcing : allows to launch a command in the process of the current shell.

Executing : allows to launch a command in a new shell.

Here is a summary of the differences between sourcing and executing:

Executing	Sourcing
launch a new shell process run the commands in this new shell	run the commands in the current shell
copy the outputs in the current shell close the new shell	send the outputs in the current shell
the changes in the environment are not taken into account in the new shell and will be lost at the closure of this new shell	the changes in the environment are taken into account in the current shell and will remain after the run
you need to have the execution rights on the script	it is not necessary to have the execution rights