If you’ve had the same Ubuntu installation for a while and have just been upgrading to newer releases, you may have noticed that a lot of older kernel versions are piling up in your grub menu and on your system.
How to remove older kernels from Ubuntu
This can be done by using the Synaptic Package Manager, [...]

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I don’t know about you but I find the login sound on Ubuntu pretty annoying. Here is a quick, nice and easy way to disable it.
How to disable Ubuntu Login and Logout sounds
Navigate to System > Preferences > Sound then click the Sounds tab.

Set the Log Out and Log In sounds to “No Sound” [...]

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If you want to delete your bash history, there are a few options you have.  First you must understand that the history of your bash session is stored into RAM and then written to ~/.bash_history when you log out of the bash session.  So even if you delete the ~/.bash_history file, your current bash session [...]

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Here is a quick tip on how to use sed to replace a line in a text file from the command line, without opening it.
Replace a Line in a File
First, replace the text you want with sed and output it into a temporary file to ensure that it is correct:
# sed -e ’s/original-text/new-text/’ textFile [...]

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Here is a quick tip on how to use sed to add a line into the middle of a text file from the command line, without opening it.
To clarify, let’s say you have a text file that has four lines:

Line1Text
Line2Text
Line3Text
Line4Text
Using sed, you can append a line anywhere you want with a simple command without even [...]

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Here is a quick Linux tip to log your boot messages in Ubuntu.  This is great for checking for any errors or failed startups that may be happening during boot.
Edit /etc/default/bootlogd:

# vi /etc/default/bootlogd

You’ll see the following lines:

# Run bootlogd at startup ?
BOOTLOGD_ENABLE=No
Change No to Yes:

# Run bootlogd at startup ?
BOOTLOGD_ENABLE=Yes
Now every time your computer restarts, [...]

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Here is a quick tip on how to find out what host IPs are on your subnet using nmap. This is useful to find out what IPs are being used or just to know how many devices are connected to the subnet.
How to find out what IPs are being used on your subnet
# [...]

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If you’re looking to get rid of the annoying system beep in Ubuntu, here is how to do it from both the command line, and from the Gnome desktop.
Disable the System Beep from the Command Line
#sudo vi /etc/modprobe.d/blacklist
And then add:
#pc speaker beep
blacklist pcspkr
Save and quit the file:
:wq
Now, remove the pcspkr module:
sudo rmmod pcspkr
Disable the System [...]

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Here is a quick Linux tip to block incoming access to port 80 using iptables.
iptables -A INPUT -j DROP -p tcp –destination-port 80 -i eth0
The code above will drop all tcp packets coming into your Linux computer on device eth0 on port 80.  If your Internet connection runs through a device other than eth0, go [...]

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Here is a quick tip on how to display the top largest files and directories within my home directory:

# du -hs /home/adam/* | sort -nr | head

Cheers!
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