Console commands to hibernate and standby on CentOS

It’s great that Linux nowadays supports all the power management features available on computers. But it’s odd that beside the buttons to trigger standby/hibernate – which are only available in a graphical interface – there are no simple console commands to put the computer to sleep or into hibernation.

Erase RAID metadata from (previously used) disk

I recently attempted to install a fresh CentOS on a pair of recycled (previously used in a different linux sistem) hard disks.

Of course I got the classical message that the disks already had RAID metadata on them: “Disk contains BIOS metadata, but is not part of any recognized BIOS RAID sets. Ignoring disk sda”

Deleting large number of files in linux

You might have often encountered the “Argument list is too long” message when trying to rm -rf large amount of files. This happens often on large servers when trying to clean up the tmp folder. This is because the rm command has a pretty low count of supported parameters (filenames) while the tmp folder can become host to a terribly high number of files (millions in a period of years).

Configure network connection via files in Linux

Setting your hostname, IP address, netmask, gateway, DNS server via files
It is sometimes helpful to know what is going on behind the scenes or if you want to modify the network configuration via changing files.
For example, assume you want to modify the network configuration by modifying files with the following…

How to Repair a Corrupt MBR and boot into Linux

There are times when you inadvertently overwrite your Master Boot Record. The end result being that you are unable to boot into Linux. This is especially true when you are dual booting between windows and Linux OSes. Once when I was working in Windows XP, I accidentally clicked the hibernate button instead of shutdown. And windows somehow overwrote my MBR which housed the GRUB boot loader. At such times, it pays to have this cool tip at hand…

Count occurences of character X in all files in current directory

If you ever need to count the occurences of a character in all (or some) files, this next series of commands would come in handy: Replace X with the character in question. The command is all in one line. “ls” can be replaced with a more specific list (eg: “ls …

How to install VMware Server 1.06 on Linux kernel 2.6.26

I updated my server’s operating system from Fedora Core 6 (on which VMware Server ran perfectly) to Fedora 8. Fedora 6 was running an older 2.6.25 (which VMware liked just fine), but Fedora 8 brought me the 2.6.26.6-49.fc8 kernel, which caused a lot of trouble.
After spending 5 hours looking everywhere for a solution (I even thought the newer v1.08 would work on this kernel – but it didn’t), I considered writing down what I did to finally get my virtual machines up and running: