Copy directory in Unix

To copy the whole directory in Unix, I used the following command

cp -R /home/yogesh/sourceDir /home/yogesh/destinationDir

Share directory between Ubuntu guest and Windows host using Virtualbox

In order to mount shared folder for Ubuntu guest with Windows host using VirtualBox I used the following commands

sudo mkdir /mnt/windir
sudo mount.vboxsf shared /mnt/windir

In virtual box seetings, I created shared path as c:\virtual\shared and folder name is shared.

Ubuntu Server proxy settings

Ubuntu Server http proxy seetings I found inside file at

/etc/apt/apt.conf

Using grep command recursively

I used following command on Ubuntu server to find specific string under directories recursively, where /etc/ is root path under which I am interested to search.

grep -r 'myString' /etc/

Set HTTP proxy under Ubuntu server

In order to set proxy globally on Ubuntu sever, I added following line to /etc/bash.bashrc file.

export http_proxy="http://serverName:8080"

Change timezone on Ubuntu Server

In order to change timezone on Ubuntu server I used the following command

sudo dpkg-reconfigure tzdata

Check MySQL version

In order to check MySQL version I used the following SQL query

show variables like 'version';

Craete tar file archive and extract it

To create a tar file archive I used the following command
tar -cvf package.tar folderName

To untar (extract) the file I used the following commnad
tar -xvf package.tar

Format Date String in DOS batch file

To format date in DOS batch file I used the following syntax,

echo %date:~8,2%%date:~3,2%%date:~0,2%

which output 100111 for 11th January 2010.

Kill all unix processes with name known

In order to kill the process in Unix withe the name of the process I used the following command, where poller is the name of the process

kill -9 `ps -ef | grep poller | grep -v grep | awk '{print $2}'`

Set time and date from command line in unix

To set date using command prompt in Unix I used the following command

sudo date MMDDHHMI

where MM is the month, DD is the date, HH is the hour and MI is the minute

Get Class name from Static method in C#.NET

In order to get class name from the static method I used the following code, using .NET reflection

String className = MethodBase.GetCurrentMethod().DeclaringType.Name;

Remove registry keys and subtrees

In order to remove the registry key and all sub-tree beneath it, create file with extension .reg and put this text in the file and double click the file. In following example all registry keys and sub trees under MyProgram will be deleted


Windows Registry Editor Version 5.00

[-HKEY_CURRENT_USER\Software\MyProgram]

Disable monitor timeout from Ubuntu server console

To disable monitor auto off from Ubuntu Server console, I used following commands

$setterm -blank 0
$setterm -powersave off
$setterm -powerdown 0

Disable Ubuntu monitor auto turn off

To disable auto turn off monitor for Ubuntu Server console I changed /etc/console-tools/config and made BLANK_TIME=0

Check the memory taken by files and directory

Check the memories taken by the files and directory I used this command

du -h -s -c *

Change Hostname of Ubuntu server machine

Edit the file /etc/hostname and put hostname in this file.

and execute /etc/init.d/hostname.sh start

Also edit /etc/hosts file and change hostname in that file.

Disable Windows XP active screensaver

From registry editor... (Run=> regedit)

HKEY_USERS -> .DEFAULT -> CONTROL PANEL -> DESKTOP, Set the "ScreenSaveActive" value to 0 and the "ScreenSavetimeOut" value to 0 to disable active screen saver.

Change Hostname of Ubuntu Machine

To change hostname of Ubuntu machine use following commands

Edit file /etc/hostname and change the hostname in that file

run the command sudo /etc/init.d/hostname.sh start

run the command sudo sysctl kernel.hostname=newHostname

Change UUID of Virtual Box Disk (VDI)

In order to change UUID of Virtual Box Disk Image (VDI) use following command from DOS command prompt.

VBoxManage internalcommands sethduuid "c:\diskName.vdi".

VBoxManage is command is located at C:\Program Files\Sun\xVM VirtualBox. You can add it to Environmental variable and then execute above command from the directory where VDI file is located