In Linux environment, we can view the calendar directly in the terminal. To do this, just simply use the “cal” command

cal command is used to display the calendar. Below are the syntax:-

cal [options] [month{1-12}] [year{1-9999}] 

OPTIONS:

Example:

To use this command, open a Terminal window and type the cal command:

By default, the command displays a calendar for the current month.

To display calendar for year 2010

To display calendar of the month Feburary 2010

If you wish to learn more how to use cal command, just type ‘man cal‘ for more details

In Windows XP/Vista/7, we can easily view the hidden files or folder by check the “view hidden file” option. How about linux? Linux do not have “view hidden file” option, any idea?

Here are the quick tip:-

# ls -a

or

# ls -la

Enjoy.

An ISO image or .iso file contains the disk image of an ISO 9660 file system. According to WIKIPEDIA, ISO 9660, also referred to as CDFS (Compact Disc File System) by some hardware and software providers, is a file system standard published by the International Organization for Standardization (ISO) for optical disc media (CD-ROMs and DVD-ROMs).

In Linux, it is possible to mount the ISO image  so that you can access the files without having to actually burn it to disk. Here is the simple way to show you mount and unmount ISO images without burning them.
1) You must login as a root user

$ su -

2) create a mount point

# mkdir /mnt/iso

3) To mount the ISO image file.iso to the mount point /mnt/iso, run the follwing command:-

# mount -o loop -t iso9660 /home/techkaki/file.iso /mnt/iso

or

# mount -o loop /home/techkaki/file.iso /mnt/iso

If you not specifying the “-t iso9660″ , it will work. The mount command is smart enough to work out that it’s a CD image.

4) Now you can verify that the ISO image is mounted 

# ls -l /mnt/iso

or

# df -hT
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/mapper/vg_techkaki-lv_root
ext4     72G   24G   48G  33% /
tmpfs        tmpfs    976M  6.3M  969M   1% /dev/shm
/dev/sdb1     ext4    194M   94M   90M  52% /boot
/dev/sdc1  fuseblk     21G   16G  4.9G  76% /media/5ECCB927CCB8FA7B
/dev/sdc5  fuseblk     55G   46G  9.5G  83% /media/data
/dev/loop0 iso9660    7.4G  7.4G     0 100% /mnt/iso

To unmount the ISO Image, use following command :

# umount /mnt/iso

Windows XP/Vista/7
Run ipconfig/all from a Command Prompt window.

• click Start, then Run, then type cmd in the text box.

• Type in ipconfig/all in the Command Prompt Windows and press enter

You should get something like this

Your MAC Address is listed under ‘Physical Address’ as a series of 6 groups of two digits, letters and numbers, separated by dashes, such as in the image below. Make sure you get the physical address of the correct network adapter – usually there are several listed.

Linux

On Linux systems, you must login as root user first before you find the Mac Address

• Launch your terminal
• Type the following command to become root user

[ahkwai@techkaki ~]$ su -
Password:

• Then, type ifconfig. Example:-


MAC OS X

Choose “System Preferences...” from the Apple menu. Then select “Network.” Double-click on “Airport” or “Built-in Ethernet” depending on how you access the Internet or your network.

For ‘Built-in Ethernet’, select the Ethernet tab.  Read the MAC address labeled ‘Ethernet ID:’.

Viewing, copying, moving and deleting files

Finding files and text within files

Archived files

Decompress

Compress

Using rpm files

Starting and Stoping

Mounting filesystems

User administration

Processes

Networking

System Information

Program Compile

I just downloaded .rar file. But i can’t open it under my Fedora operating systems. How to open it?

RAR is a proprietary compression format widely used today. By default, Fedora unable to open RAR files. So, you need to install a software called unrar.

How to install unrar on Fedora?

Just use yum command as follows :

# yum install unrar

Under Ubuntu, you need to type apt-get as follows to install unrar program:

# apt-get install unrar

How to use unrar?

Extract a RAR file into the current directory.

# unrar e [filename].rar

eg: # unrar e testing.rar

List contents of a RAR file

# unrar l [filename].rar

eg: # unrar l techkaki.rar

If you want to know more on how to use unrar function, you just type man unrar on your terminal.

Once you installed MySQL, you might need to set the MySQL root password to protect your DB. Actually how to do that?

Just type the following command on your terminal

[root@techkaki] # mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

 [root@techkaki] # mysqladmin -u root -p 'oldpassword' password newpass

Eg:

[root@techkaki] # mysqladmin -u root -p 'abcdef' password '123456'

Is it possible to use Windows Live Messenger on Linux? The answer is yes. You can try to install aMSN to run the Windows Live Messenger. aMSN is a free Windows Live Messenger clone. aMSN attempts to emulate the look and feel of Windows Live Messenger, and supports many of its features.

The features of aMSN include:-

• Offline Messaging
• Voice Clips
• Display pictures
• Custom emoticons
• Multi-language support (around 40 languages currently supported)
• Webcam support
• Sign in to more than one account at once
• Full-speed File transfers
• Group support
• Normal, and animated emoticons with sounds
• Chat logs
• Timestamping
• Event alarms
• Conferencing support
• Tabbed chat windows

Most of the linux distributions already include aMSN in their package collections. You can install aMSN directly with your package manager, without having to download it from aMSN web site.

Here i going to show your how to install aMSN on Ubuntu and Fedora using command line.

How to install aMSN on Ubuntu? Just type the following command on your terminal

sudo apt-get update
sudo apt-get install amsn

How to install aMSN on Fedora? Just type the following command on your terminal

yum install amsn

After you install aMSN, try to launch the aMSN program from your menu. You will see the aMSN prompt out and the interface also same as Windows Live Messenger

Firefox always release new version. We can easily upgrade it via terminal command.

How to do that? Follow the steps below:

For Ubuntu / Debian Linux

 sudo apt-get update

 sudo apt-get install firefox

For Fedora / Redhat / Centos Linux

 yum update 

 yum install firefox 

Done.

There is a bug with the Gnome Network Manger on Ubuntu 8.10. We have to set the static ip address manually. Once the system is reboot, it will reverting back to DHCP setup.

This problem can be solve by remove the Gnome Network Manager. To remove the Gnome Network Manager, use the following command in the terminal:

sudo update-rc.d NetworkManager remove

After that, reboot your system.

Step 1 – How to set the static ip

We need to manually configure the network interface file when you want your Ubuntu run on static IP environment

Enter the following command into the terminal:

nano /etc/network/interfaces

After that, enter the following information to the network configuration files

auto lo eth0
iface lo inet loopback
iface eth0 inet static
address xxx.xxx.xxx.xxx(enter your ip here)
netmask xxx.xxx.xxx.xxx
gateway xxx.xxx.xxx.xxx(enter gateway ip here)

Please save it before you exit the configuration file.

Step 2 – Manually configure your dns configuration file:

Enter the following command into the terminal:

sudo nano /etc/resolv.conf

Once the DNS configuration open, enter the following information

# Generated by NetworkManager
nameserver xxx.xxx.xxx.xxx(enter your dns server ip)
nameserver xxx.xxx.xxx.xxx(enter your alt dns server ip)

Please save before you exit the configuration file.

Step 3 – Restart the network interfaces

Enter the following command in the terminal:

sudo /etc/init.d/networking restart

After that, your network interface should be able to run on new setting(static ip) even you restart your machine. You can try to check on by using ifconfig command in your terminal.

Just try it