samba: files written to public share belong to nobody

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http://unix.stackexchange.com – I have setup a samba share like this: [shared] path = /home/shared/ comment = shared public = yes writable = yes printable = no I can access it from windows, but when I upload files to it, the files I uploaded have the following permission: -rwxr--r-- 1 nobody nobody 899381 Mar 7 11:59 letter17.rtf What I would like to see is that, when a user accesses this share, the user acts as if he was a particular user of the samba server(say dave). So that he has access to files that 'dave' has access to, and the files he uploaded belongs to 'dave'. which option do I use t (HowTos)