Downgrade iPod touch, iPhone from 3.1.1 to 3.0 firmware
You can now jailbreak iPod touch 3.1.2 (iPod touch 2G). Click here for the procedure. A few days ago, Apple released firmware 3.1.1 for iPod touch and iPhone…
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394 notes on Linux, tools and troubleshooting
How to check the SUSE Linux Enterprise and Open Enterprise Server for Linux version
Use `uname -r` to check the kernel version and compare it with the SUSE Linux Enterprise and Open Enterprise Server for Linux versions.
How to read memory usage with the free command
Linux uses RAM extensively to cache local and remote filesystem and disk data. The free command shows used, free, cached, and application memory.
The "Mailbox is locked by POP server" problem
Cyrus-imapd commonly reports "Mailbox is locked by POP server" when more than one POP3 connection attempts to retrieve mail for the same user simultaneously.
How to check the version of Red Hat Enterprise Linux and CentOS Linux
Check Red Hat Enterprise Linux or CentOS versions by reading /etc/redhat-release or using uname to identify the release from its kernel version.
Change I/O Disk Scheduler without Reboot
There are four I/O schedulers for hard disks and block devices: anticipatory, noop, deadline, and CFQ. CFQ is usually the default. To change the I/O scheduler…
How to Restore Defaults Gnome Desktop Environment
Restore the default GNOME desktop environment: enter runlevel 3 with #init3, log in as root, go to the user's home directory, and remove .gnome* files.
RHCE Red Hat Certified Engineer Linux Study Guide (Certification Press)
RHCE Red Hat Certified Engineer Linux Study Guide provide a hundreds of practice questions and hands-on exercises. The RHCE Red Hat Certified Engineer Linux Study Guide is up to date for Red Hat Enter
Yum, Yellow dog Update, Modified and How to use Yum
Yum, or Yellow dog Update, Modified, manages RPM package installation, removal, and updates, resolving dependencies from configured repositories.