Examples of ‘head’ command

To print out the first 10 lines of a file
head [filename]

To print out the first 50 lines of a file
head -n 50 [filename]

To print out the first 25 bytes of a file
head -c 25 [filename]

Navigate to System –> Administration –> Printing

Then choose Server –> New –> Printer from the Printer configuration window

The New Printer wizard will be displayed. Here you can add either local or network printers. For this tutorial, we will show you how to add a Network printer. To do this, expand the Network Printer tree item and choose Windows Printer via SAMBA.

Click on the button labeled Browse… which will display a list of servers on your network. Find your corporate print server or Windows system that the printer is connected to. You should see one or more printers listed. Choose the printer and click OK.

You will now need to select the manufacturer of the printer so that the appropriate driver can be installed. Make your selection and click on the button labeled Forward.

Once you have chosen the printer manufacturer, you must select the model number. Make your selection and then click Forward. Note: If you do not see your model listed, please visit the printer manufacturer’s website to download the appropriate driver.

We’re almost done! Now you can specify the printer name and description so you can easily identify it in the future. Click Apply after doing so.

Finally, you will be greeted with a prompt to print a test page. It is a good idea to do this, so click Yes.

And there you have it. That is how you add a network printer to your Ubuntu 9.10 system!

If you are like me, you have run into this situation many many times. You run the ps command to list all the currently running processes and you see that there are multiple instances running of a certain program. You want to end all these instances but do not want to run the kill command for each one of those specifying the pid manually. Killing all instances of this program is very simple and I’ll show you how to do it using a 1 line command!

How to Kill multiple instances of a process

1. Log into the shell of your Linux/Unix box
2. If you do not know the name of the script you will like to kill, run: ps -ef This will show you a list of all the currently running processes. In the right-most column, you will find the path and filename of the script you want to end.
3. To kill all instances of this script, run the command: ps -ef | grep [search string] | awk '{print $2}' | xargs kill -9 Be sure you substitute [search string] to your own value.
4. Now run ps –ef again and all running instances of that script will be gone!

Alternative Method

If your Linux distribution has pkill installed, simply run the command:

pkill -9 -f [search string]

Navigate to System –> Preferences –> Display

This screen will look similar to the Windows display preferences. Next to Resolution, you will see a drop-down list of supported monitor resolutions you can switch to.

Click on the down-arrow to expand the list of resolutions and choose one. After you are done, hit the Apply button.

If your screen turns completely blank, this means the resolution you selected is not supported by your monitor. Keep trying various options until you find one that works best for you!

If you would like to find out how to add custom resolutions that to not appear in the drop-down list, stay tuned. Part II of this article is coming (hopefully by 11/25)

• Faster start-up times
• Upgrade to Gnome 2.28
• Now available in 25 different languages
• New Intel video driver architecture for improved performance
• ext4 is now the default filesystem
• and many many more!

How to upgrade to Ubuntu 9.10?

1. Navigate to System -> Administration -> Update Manager
2. Click the Upgrade button next to the text New distribution release ‘9.10 is available’
3. Sit back and relax while it downloads and installs ~700 MB of packages!

Ubuntu 9.10 download & release information

To disable password prompts in Ubuntu 9.04

1. From ther terminal window, run the command:

   sudo visudo

2. Find the line that says:

   %admin ALL=(ALL) ALL

   and change it to:

   %admin ALL=(ALL) NOPASSWD: ALL

3. Save file by hitting Ctrl-X
4. Thats it!
   

How to install SSH on Linux (Ubuntu)

1. Run the command:

apt-get install ssh openssh-server

2. Verify the SSH service is installed and running properly:

ssh [hostname/ip of server]

3. Thats all!

Assigning a hostname to a Solaris 10 machine

1. Login to the command-line terminal of the Solaris 10 box
2. Open the file /etc/default/dhcpagent in your favorite text editor, such as vi.
3. Make sure that the line containing REQUEST_HOSTNAME is not commented out (remove the #) and has a value of ‘yes’. For example:

REQUEST_HOSTNAME=yes

4. Edit the /etc/hostname.interface file and add the following line:

inet hostname

interface is the name of the network interface to make the changes to (ex. bge0, nge0)
hostname is the name you want the machine to use

5. Type the following commands to clear the DHCP cache:

# ifconfig interfacedhcp release
# reboot

interface is the name of the network interface to make the changes to (ex. bge0, nge0)

If you still cannot access it by hostname…

1. Ensure  /etc/nodename has the desired hostname as the first and only line in the file
2. Ensure /etc/hosts has the IP address and hostname of the machine

To Restart the SSH Service

1. Login to the command-line terminal
2. Run the command:

svcadm restart svc:/network/ssh:default

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