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I own a particular file on a Linux system. I would like to give 2 groups (accounting, shipping) read access and only read access, and 3 users(Mike, Raj and Wally) write access and only write access.

How can I accomplish this?

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I suggest using POSIX ACLs (Access Control Lists). Your filesystem must support them / have the acl option enabled, but if it does, then your problem simplifies to:

setfacl -m u:mike:w myfile
setfacl -m u:raj:w myfile
setfacl -m u:wally:w myfile
setfacl -m g:accounting:r myfile
setfacl -m g:shipping:r myfile

And you can do that for arbitrary sets of permissions.

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