20. Set the default UMASK for user-created files
For the user natasha:
* The default permission for newly created files should be r--r--r--
* The default permission for newly created directories should be r-xr-xr-x

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Copy /etc/fstab to /var/tmp name admin, the user1 could read, write and modify it, while user2 without any permission.

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A YUM source has been provided in the
http://instructor.example.com/pub/rhel6/dvd
Configure your system and can be used normally.

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Successfully resolve to server1.example.com where your DNS server is 172.24.254.254.

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Create a volume group, and set 16M as a extends. And divided a volume group containing 50 extends on volume group lv, make it as ext4 file system, and mounted automatically under /mnt/data.

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