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How To Patch and Protect Linux Server Against the VENOM Vulnerability # CVE-2015-3456

A very serious security problem has been found in the virtual floppy drive QEMU’s code used by many computer virtualization platforms including Xen, KVM, VirtualBox, and the native QEMU client. It is called VENOM vulnerability. How can I fix VENOM vulnerability and protect my Linux server against the attack? How do I verify that my server has been fixed against the VENOM vulnerability?
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Linux Change Disk Label Name on EXT2 / EXT3 / EXT4 File Systems

How can I modify partition labels on a Linux operating systems? How to change disk name on the ext4 file system on a Ubuntu Linux using command line?
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Bash: Reissue And Repeat A Long Command Without Retyping It on a Linux, OS X & Unix

I‘m a new Ubuntu Linux user. In Linux, Apple OS X or Unix-like systems, how do I reissue or repeat a long command without retying it?
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Glibc: GHOST Vulnerability Test To See If a Linux Sever Is Secure

The GHOST (CVE-2015-0235) is serious network function vulnerability in Glibc. How do I check and test if a my Linux based server is secure using command line options?
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Linux: Start / Stop / Restart Apparmor

AppArmor is a Linux Security Module (LSM) implementation of name-based mandatory access controls (MAC). How do I start / stop / restart AppArmor under Ubuntu Linux or OpenSuse / Suse Enterprise Linux server systems running on IBM hardware?
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I‘m setting up server on an Amazon EC2 compute instance powered by Suse Enterprise Linux server. I am using the following command to login into the my EC2 compute from OS X/Ubuntu desktop:

ssh -i suse-ec2-server-jp.pem root@ec2-xx-yy-zzz-yyy.compute-1.amazonaws.com

I am getting the following error:
Permissions 0440 for 'suse-ec2-server-jp.pem' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: suse-ec2-server-jp.pem

How do I fix this problem and login using ssh command?
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Linux: Update All Packages Command

How do I update all installed packages on Linux operating systems? How do I perform upgrading packages through a network on Linux operating systems?
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Linux: Show All Members of a Group

I am a new Linux user and created couple of groups on server. I need to find out all members of a group called “ftponly”. How do I list all members of a group on Linux or Unix-like systems?
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Unix / Linux: Show First 10 or 20 Lines Of a File

I have a directory with many files. I am trying to write a shell script that will only show first 10 or 20 lines of a file. How do I display first 10 or 20 lines of a file on Linux or Unix-like systems?
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HowTo: grep All Sub-directory For Files

How do I grep all sub directories? How can I use grep command through all sub-directories on Linux or Unix like operating systems? How do I use grep to find pattern including all subdirectories on OS X/BSD/Unix-like operating systems?
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