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You can also install GNOME Shell from the terminal with the following command:
# sudo apt-get install gnome-shell
To access GNOME Shell, sign out of your current desktop. From the login screen, click the little button next to your name to reveal the session options.
Reboot your computer.
Press SHIFT at the grub prompt.
Select your image.
Highlight the line that begins kernel and press e to edit
MongoDB is one the popular nosql database.It is a cross-platform document-oriented database system.MongoDB has its interactive shell called mongo .
Login as root.
#apt-get install mongodb-10gen
The hwinfo command is a very handy command line tool that can be used to probe for details about hardware components. It reports information about most hardware units like cpu, hdd controllers, usb controllers, network card, graphics cards, multimedia, printers etc.
login as root:
#usermod -l newname oldname
Ubuntu 12.04 use resolvconf(a set of scripts and hooks) instead of resolv.conf to manage DNS server. The most notable difference for the user is that any change manually done to /etc/resolv.conf will be lost as it gets overwritten next time something triggers resolvconf.
Unix provides a service called cron that runs programs repeatedly on a fixed schedule. Most experienced administrators consider cron to be vital to the system because it can perform automatic system maintenance.
How to patch OpenSSL’s Heartbleed Vulnerability
First you need to understand that not all version of OpenSSL are vulnerable.
Below are the version of OpenSSL that are affected by this bug.
“crashkernel=X@Y” is a kernel parameter for Kdump.
Kdump requires some memory reservation for the second kernel(capture kernel).
When kdump is enabled, (physical memory – X) will be allocated.
