[LARTC] How can I add INTERNAL commands to shell?

[Salil Mehta]

Hi,

How can I add a new commands (Internal not shell based external commands) to
OS *command interpreter* i.e shell (bash, sh, ksh etc..)
Is there any document available for that? Can I know where can I get the
source code of bash/sh? Also, I wanna know where does parsing
of commands within the shell code happens.

Thanks In Anticipation
Regards
Maverick
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