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Linux: Find Out What’s Using Up All Virtual Memory

How do I list or display all processes, executables, and shared libraries that are using up all virtual memory under Debian or Ubuntu Linux server for troubleshooting purpose?
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I'm getting the following error when I run mysql -u root -p

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

How do I solve this problem under CentOS / RHEL / Red Hat Enterprise Linux server 5.x or 6.x?
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Linux sys-unconfig: Reconfigure the System Upon Next Boot

I can use unconfigure command on a previously configured Solaris Unix box and leave it in an unconfigured state. How do I unconfigure CentOS Linux OR RHEL 6.x on HP server. How do I reconfigure the system upon next boot?
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Linux Gnome: gconf-sanity-check-2 Exited With Status 256 Error and Solution

When I try to login into my Linux Gnome based desktop system, I get the following error from GDM :

gconf-sanity-check-2 exited with status 256

How do I fix this problem?
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Linux mount: Bind or Remount Part Of File Hierarchy At Another Directory

How do I mount the contents of /home/multimedia in two places under Linux operating systems?
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Debian Linux: Install Virtualbox Virtualization Software

I'm a home user and how do I install VirtualBox virtualization software for my home use under Debian Linux 6 operating systems?
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Mount CD-ROM / DVD in HP-UX Unix

How do I mount CD or DVD on HP-UX Unix operating systems?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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HowTo: Change Password of Specific User Account In Linux

How do I change passwords for specific user account under Linux operating systems using command line?
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HowTo: Shutdown Linux System

I'm a new Linux user. How do I shutdown Linux based system using command line options?
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