Perintah sumber dalam skrip shell
## Defination -------------------------------------
# Source is a bash shell built-in command that executes the content of the file
# passed as argument, in the current shell. It has a synonym in `.` (period).
## Syntax -----------------------------------------
> source filename [arguments]
or
> . filename [arguments]
## Additional Informaion ---------------------------
# Be careful! ./ and source are not quite the same.
> ./script # runs the script as an executable file, launching a new shell to run it
> source script # reads and executes commands from filename in the current shell environment
# Note: ./script is not . script, but . script == source script
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