If we want to create User ID in System, How can we assign the same user ID to different User in Linux

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Raja please use appropriated titles: http://www.daniweb.com/community/rules
This is the fifth thread you start with the same generic title.

I'm not sure why you'd want to have duplicate user IDs offhand, but it is possible:
Using the -o option with commands like useradd, adduser and usermod will allow you to use duplicate/non-unique UID's.

Take a look at the documentation for them online: useradd, adduser and usermod.
Or take a look at the man pages and info pages for them on your own Linux system!

thanks jason

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