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I want to create two user with only read permission to their home folder. And other new user which can read write and execute the file in above two user folders.

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This is not (easily) possible with linux as some files are written to the home directory (e.g. .xsession-errors or .bash_history).

You can create a new group and assign this group to the users that only read files. Then give the file permission rw-r----- to the files and assign the created greoup to the files. So the users can only read the files. Also you can give the permission rwxr-x--- and assign the group to all directories so that the users may not write files into directories.

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I have to create user for sftp login. –  Kalim Sayyed Jul 11 '13 at 8:58
    
@KalimSayyed and why should this users not be able to write? Should they only download files? –  Uwe Plonus Jul 11 '13 at 9:11
    
yes..they only download files –  Kalim Sayyed Jul 11 '13 at 9:51
    
@KalimSayyed I extended my answer accordingly. –  Uwe Plonus Jul 11 '13 at 10:03
    
@KalimSayyed: Doesn't SFTP allow setting of different "home" directories where the user ends up on login? That would allow to set them to a read-only directory (for them). –  Bobby Jul 11 '13 at 10:05
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