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Linux Find And Report On File Fragmentation

How do I find out badly fragmented a particular file might be under Linux operating systems?
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RHEL 6 / CentOS 6: Install Adobe Flash Player For Firefox Browser

U'm using RHEL 6.x workstation with Mozilla Firefox 3.x. How do I install flash player so that I can use video site such as You-tube under RHEL 6.x or CentOS Linux 6.x 64bit operating systems?
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Linux Download Password Protected Large ISO Images [ Authentication Credentials ]

I'm trying to download an ISO image for Enterprise Linux from RHN or Novell Suse. Both providers have placed ISO images behind paywall. I need to provide authentication credentials before downloading all files. How do I download ISO files using the wget command with user name and password?
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Install Iptables Firewall in Redhat / CentOS Linux

How do I install iptables under Redhat (RHEL) or CentOS or Fedora Linux operating systems?
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HowTo: Restart UNIX System / Server

How do I restart UNIX server or workstation?
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SSH Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys2

I'm trying to login using ssh keys but server is only allows to login me using a password. The following message is logged into server /var/log/secure file:

Feb 25 06:36:50 ns5 sshd[26681]: Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys2

How do I fix this problem?
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