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Linux: Find Out Open Files [ Descriptors ] Command

How do I find out that how many files are open and how many allowed in Linux server operating systems?
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Gnome Volume Control: Disabled Sound Themes

Problem is that every time I click something I get annoying sound from computer speaker. So I tried to disable or set new sound theme by visiting System > Preferences > Sound. The Sound Theme tab is greyed out. Sound itself is not working and I can only get annoying sound. How do I fix this problem under Debian or Ubuntu Linux gnome desktop system?
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HowTo: Check Ram Size From Redhat Linux Desktop System

How do I check the ram size from my Redhat Linux desktop system using command line and GUI tools? How do I find out memory size on Red Hat Enterprise Linux server?
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Linux / UNIX: Speed up SSH X11 Forwarding

I've an CentOS based server and Ubuntu based desktop pc. I'm connecting to my CentOS using ssh X11 forwarding feature. However, speed over the Internet is pretty slow for certain apps such as VMWare console. How do I speed up OpenSSH X11 forwarding using Linux / UNIX desktop system?
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HowTo: Check RAM Size In Ubuntu Linux

How do I check amount of RAM in my Ubuntu Linux laptop or desktop system/server using GUI and command line tools?
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Redhat Linux: Find Out My IP Address

How do I to find out ip address on a CentOS or Fedora or Redhat Enterprise Linux server or desktop system using bash shell or command line options?
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CentOS / Red Hat Configure an NTP Client And Server

How do I configure an NTP (Network Time Protocol) client or server under CentOS / RHEL / Fedora Linux to manage the system clock over a network?
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Can I Use Multiple Virtualization Technologies Simultaneously under Linux?

Q. I was reading this article and wanted to try out KVM, XEN, VMWare and VirtualBox simultaneously on my desktop system with 2GB RAM? Why I'm not able to use run multiple virtualization technologies simultaneously under Ubuntu Linux? Can a powerful Linux server run multiple virtualization technologies simultaneously?
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Linux ATI HD3750 Drive Configuration Hangs

I'm not able to boot into GUI under Dell desktop system, which uses an an ATI HD3750 display card. The display only works with CLI and but when I type startx and get some sort of error or a black screen. How do I fix this issue?
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Linux X11 Connection Rejected Because of Wrong Authentication Error and Solution

Q. I'm trying to login to my remote Ubuntu Linux server from Mac OS X desktop using following command:
ssh -X user@vpn.officeserver.example.com xeyes

But I'm getting an error that read as follows:

X11 connection rejected because of wrong authentication.

How do I fix this error?
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