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@jjangid
Open a console and type "man sh" (without the quotes of course), and then "man source".
This will tell you that sh is a shell (the original shell, by the way), and that source is a shell builtin.
A builtin is a command that is built into the shell, and is not a separate program in /bin or /usr/bin. I would say that there are about 65 of these. Unless you plan to learn shell scripting, you will probably not need to worry about many of them.
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sh and source command
