How can I add INTERNAL commands to shell?

["Salil Mehta" <mehta.salil@xxxxxxxxx>]

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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