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Linux Permission II

1. Create 3 users as dhirubhai, mukesh and anil.
2. In "/" create a folder called 'ambani'. Inside ambani create three separate folders called 'communications', 'petroleum' & 'power'.
3. All three users have view permission in ambani folder.
4. User dhirubhai should have full access to communications and view acces in other folders.
5. User mukesh should have full access to petroleum and view access in other folders.
6. User anil should have full acces to power and view access in other folders.
7. No other user should be allowed.