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3265 post 1
Commands that need to modify the running user structure defined in scli.h 
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should reside here. They (will) have a slightly different prototype that
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allows passing the user structure to them for ease of modifications.
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Examples of what should be a built-in and not a module would be:
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3366 post 7
cd     (cliuser_t->cwd needs to be updated)
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3366 post 9
In the future, more user preferences will be set via built-in commands,
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such as the formatting of the prompt string (HelenOS doesn't yet have
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an environment, much less PS*, even if it did we'd likely do it a little
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differently).
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3265 post 14
.... etc.
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3366 post 16
Anything that does _not_ need to use this structure should be included
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as a module, not a built in. If you want to include a new command, there
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is a 99% chance that you want it to be a module.
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