Friday, August 8, 2014

How to clear browser's cache and cookies from terminal in ubuntu

1) Clean up memory on linux
$ sync; echo 3 | sudo tee /proc/sys/vm/drop_caches

2)Clear filesystem memory cache
$ sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

3)Release memory used by the Linux kernel on caches
$ sbin/sysctl -w vm.drop_caches=3

4)Clear the cache from memory
$ sync; echo 3 > /proc/sys/vm/drop_caches

5)Clear filesystem memory cache
$ sysctl -w vm.drop_caches=3

6)How to clear bash history completely
$ cat /dev/null > ~/.bash_history && history -c && exit

Thursday, August 7, 2014

How to fix Press S to Skip Mount during boot on Ubuntu

1. At Terminal, type sudo gedit /etc/fstab
How to fix Press S to Skip Mount during boot on Ubuntu
(Note: It will ask for a administration password, or your own account password, type it and press Enter.)
Then the gedit with fstab file appears.

2. Find the line or entry that cause the error message. See the below example. Then delete or remove that line or entry.
How to fix Press S to Skip Mount during boot on Ubuntu

3. Then save to gedit fstab file, click File then click Save. Then exit geditfstab file. Restart your computer you will notice that the error message will gone in no time.

Wednesday, April 30, 2014

Disable or Enable USB Mass Storage Devices using Registry

If the administrator is smart then he would definitely do this to ensure a tight blockade. He would alter the settings through regedit command on run console. Now how do you unlock it ? You have to go right into where the administrator has been. Here is how.

Go to Start > Run , type “regedit” and press enter to open the registry editor
Navigate to the following key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR
In the right pane, select Start and change the value to 3. (The value 4 will disable USB Storage). Click OK. This will re-enable USB Ports and allow you to use USB or Pen drives.

How to Disable and Enable USB Device in Linux/Ubuntu

Open a Terminal by using Ctrl+Alt+T or Applications->Accessories->Terminal. You need to have root access to do this tweak. Copy and paste the following command in the Terminal. Type the password for the user, when prompted.

sudo gedit /etc/modprobe.d/blacklist.conf

Now copy and paste this line “blacklist usb_storage” at the end of the file. After adding this save it and close the gedit.

2) Add this line “modprobe -r usb_storage” before exit 0 in /etc/rc.local
To add : Copy and paste the following command in the Terminal. Type the password for the user, if prompted.
 sudo gedit /etc/rc.local
The above command will open the rc.local file in gedit. Now copy and paste this line “modprobe -r usb_storage” before the last line of the file. After adding this save it and close the gedit. Check the below screen shot for Fedora and Ubuntu.

Disable or restrict the use of Windows Installer via Group Policy

Type gpedit.msc in start search and hit Enter to open the Group Policy Editor.
Navigate to Computer Configurations > Administrative templates > Windows Components > Windows Installer. In RHS pane double-click on Disable windows installer. Configure the option as required.
1) He “Never” option indicates Windows Installer is fully enabled. Users can install and upgrade software. This is the default behavior for Windows Installer on Windows 2000 Professional, Windows XP Professional and Windows Vista when the policy is not configured.
2)The “For non-managed apps only” option permits users to install only those programs that a system administrator assigns (offers on the desktop) or publishes (adds them to Add or Remove Programs). This is the default behavior of Windows Installer on Windows Server 2003 family when the policy is not configured.
3)The “Always” option indicates that Windows Installer is disabled.
This setting affects Windows Installer only. It does not prevent users from using other methods to install and upgrade programs.

Thursday, April 24, 2014

How to Login as a root from GUI | Ubuntu 12.04 LTS Precise Pangolin

You just need to follow these 5 Steps and you will able to Login as a root From GUI in Ubuntu 12.04 LTS Precise Pangolin.

1) First login as a normal user which you have created during Installation.

2) Open terminal by pressing “Ctrl+Alt+T”

3) Execute Below Command.

sudo passwd root

[sudo] password for sachin: ****** (Normal User Password)

Enter new UNIX password: ******

Retype new UNIX password: ******

4) That’s It. You have successfully Setup Your root user’s password. Now Log out from Current User.

5) Now reboot Ubuntu 12.04 LTS Precise Pangolin, You will see “OTHER”. Click on it ,which asks for Username and Password on Login screen/Window.

Most probably you wont find the other option, so here are the steps to add the other option!

Make sure you have completed the above steps,not press ctrl+alt+T to fire up a new terminal window

1. sudo cp -p /etc/lightdm/lightdm.conf /etc/lightdm/lightdm.conf.orig
2. sudo /usr/lib/lightdm/lightdm-set-defaults -m true
3. sudo /etc/init.d/lightdm restart

Now you are all set to go , a new option “LOG IN”  is added to the log in menu, type the username as “root” and your super user password as your password there !

Tuesday, March 4, 2014

Create an ISO Image from a CD or DVD in Ubuntu

1. Insert the CD or DVD that you want to make an ISO image of.
2. Open a terminal window.
3. Execute the following command:
cat /dev/scd0 > /home/shamanstears/test.iso

where /dev/scd0 is the device name for your drive (to find this, go to disk utility. Also make sure to change the path and iso filename to the desired path and filename.
The disc will begin to spin and the ISO image will start being constructed. Once it has completed, you have an ISO image of your CD. To verify that the image was properly created, mount the ISO file and check the contents.

Saturday, June 29, 2013

Change Ubuntu root Password

Step 1:

Switch the computer on. Go to Grub menu. Generally it appears automatically, if not then HOLD DOWN the SHIFT KEY until the boot menu appears. In the grub menu, choose for therecovery mode option.
It will bring you a black screen with several lines of output being displayed in a flash. Wait for few seconds here.

Step 2:

Now you will be present with different options of recovery mode. Here you need to choose “Root Drop into root shell prompt“. Like in the picture below:

Step 3:

Here, you will be presented with root access (why? Is this not a security fault?) without prompting any password. Use the following command to list all the users available:
ls  /home
From the previous command choose the “username” for which you want to reset or (say) hack the password. Now, use the following command to reset the password for the selected “username“:
passwd username
It prompts for new password. Enter the new password twice:
Enter new UNIX password:
Retype new UNIX password:
VoilĂ ! There you go. You have just cracked it and now you can easily enter into the system.

Possible Troubleshoot:

While entering the new password you might be prompt with Authentication manipulation error like this:
passwd username
Enter new UNIX password:
Retype new UNIX password:
passwd: Authentication token manipulation error
passwd: password unchanged
The reason for this error is that file system is mounted with read access only. Change the access and remount the file system in the following manner:
mount -rw -o remount /
Now try to reset the password again. It should work now.


Thursday, May 23, 2013

How to stop outlook express message to free up disk space


1) Start the registry editor.
2) Open this key:

HKEY_CURRENT_USER\Identities\{identity}\Software\Microsoft\Outlook Express\5.0

3) where identity is a string of letters, numbers, and dashes.
4) Set the value of Compact Check Count to 0.
5) Close the registry editor.

Tuesday, July 24, 2012

Create Bootable USB Pen Drive for Windows 7


Tools Required:
1. USB flash drive with a minimum capacity of 4 GB.
2. Windows 7 Setup DVD.
Step 1 : Plug-in your USB flash drive.
Step 2 : Open the PowerShell (OR Command Prompt if PowerShell Not Exist). If you are using Windows 7/Vista then open it with administrator rights*.
* Goto Start -> All Programs -> Accessories ->Windows PowerShell ->  Right-click on “Windows PowerShell” and select “Run as Administrator”.
Step 3: In the PowerShell, type 
DISKPART
This will start the Microsoft DiskPart utility as shown below:
Now issue the following command:
LIST DISK
This will show you a list of  available disks on your system. Disk 0 is usually the hard disk. In my case, Disk 1 is the USB drive (this can be a different one in your case). Now issue the command as shown below:
 SELECT DISK 1
 above command, 1 is the USB drive number on my system. If you have a different number on your system, then you need to replace 1 with that number.
Step-4: Now issue the following list of commands one by one as shown below:
 CLEAN
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT FS=NTFS QUICK
ASSIGN
EXIT
 Close Power Shell and proceed to the next step.
Step 5: Insert the Windows 7/Vista installation disc and note down the “drive letter” of your DVD drive. In my case, it is “H:”.
Open the command prompt. If you are using Windows 7/Vista then open it with administrator rights*.
* Goto Start -> All Programs -> Accessories -> Right-click on “Command Prompt” and select “Run as Administrator”.
 Now type the following list of commands as shown below:
H:
CD BOOT
BOOTSECT.EXE /NT60 G:
G: is your USB drive letter)
EXIT
Step-6: Copy the contents of your Windows 7/Vista installation disk into the USB flash drive.
Directly Copy-Paste All DVD file into Usb Stick Then…
Your USB stick is now ready to boot and install the OS for you. Don’t forget to enable the “USB Boot” option and change the “Boot priority to USB device from hard disk” in your BIOS settings.