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I am using Ubuntu 13.10. I would like to give any user who logs in as guest the permission to read from the harddisk, without having to enter the password. However, guest users should not have the permission to write to the harddisk or delete files from it.

How can I do that?

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have you tried setting the read and execute permission for "Others" using chmod –  udiboy1209 Apr 7 '14 at 9:56
chmod never came to mind i will give it a try will see whether it works or not –  user3346568 Apr 7 '14 at 10:00
@udiboy is definitely correct. I won't write an answer, as he deserves credit, but the command would be chmod -R o+r-w /path/to/directory. You might need to run it as root, depending on the existing permissions. Make sure you have the correct path, as you cannot revert this easily. –  Sparhawk Apr 7 '14 at 11:15

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