Commands using sudo

Useful mainly for debugging or troubleshooting an application or system, such as X11, Apache, Bind, DHCP and others. Another useful switch that can be combined with -mmin, -mtime and so forth is -daystart. For example, to find files that were modified in the /etc directory only yesterday:

Saved my day, when my harddrive got stuck in read-only mode.

This will create an exact duplicate image of your hard drive that you can then restore by simply reversing the "if" & "of" locations.

Alternatively, you can use an SSH connection to do your backups:

Add the functions to the .bashrc to make it work

Example: First go to the iso file directory and type:

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user@box:~$ miso file.iso

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It will put you into a temporary mounting point directory (ISO_CD) and will show the files

You can umount the iso file whatever the directory you are

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user@box:~/ISO_CD$ uiso

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It wil umount the iso file and remove the temporary directory in your home

I often forget to type sudo before a command that needs it. This is the quickest way to rerun the command prefixed by sudo.

Someone might attack on your system. You can drop attacker IP using IPtables. However, you can use route command to null route unwanted traffic. A null route (also called as blackhole route) is a network route or kernel routing table entry that goes nowhere. Matching packets are dropped (ignored) rather than forwarded, acting as a kind of very limited firewall. The act of using null routes is often called blackhole filtering.

An apt-get wrapper function which will run the command via sudo, but will run it normally if you're only downloading source files.

This was a bit of an excuse to show off the framework of

...but as you can see, you must be careful about what is in the "true" block to make sure it executes without error, otherwise the "false" block will be executed.

To allow the apt-get return code to pass through, you need to use a more normal if/else block:

This will give you the Dell Service tag number associated with your machine. Incredibly useful when you need that number for tech support or downloads.

List the commands you have the right to use with sudo.

Opens a new shell as root. Useful if you want to run a lot of commands as superuser without needing to sudo each of them.

This is the solution to the common mistake made by sudo newbies, since

does NOT add to the file as root.

Alternatively,

should be replaced by

And you can add a >/dev/null in the end if you're not interested in the tee stdout :

when I turn on my wifi, I always have to put in this command in order to make my laptop notice the wifi.

wanna know something about your hardware? how about EVERYTHING?? then this should do ya well

if you lose your sound, this will restart alsa and you will get your sound back

After you install/remove lots of packages, there are many packages marked with 'rc'. This script help you to purge these packages, it will save some spaces from your disk.

In July 2008, there was an uproar over Foxconn motherboards feeding Linux installs incorrect ACPI information (http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=869249).

Foxconn has gladly corrected their mistake, but make sure it's not happening on your motherboard!

After running the command, just view the 'dsdt.dsl' in any editor you like.

this application monitors the apps you use most often and load them into memory with their libraries and other dependencies.

So now, when you launch Firefox or Thunderbird or OpenOffice, the display is immediate as on Mac.

In some applications on eeepc xandros 7, default OS, video ccamera is not available untill you enter this command