Sensing...

#Delete empty lines from a file sed '/^$/d' file.txt # do the same in the source file itself sed -i '/^$/d' file.txt # copy contents from a file from 3rd line sed -n '3,$p' file.txt #copy specific lines from a file(e.g. copy line 2 to 4) sed -n 2,4'p' file.txt

To install JDk 6 (Java Developement Kit 6 ) in ubuntu 10.04 from the command line, we just need to use the following command. This will install all other dependencies automatically.  sudo apt-get install openjdk-6-jdk

We may think that why to bother typing commands when using the GUI to shutting down the computer is easy and straight. But at time we may want to shut down the computer after some time when the download finishes or some other task completes. But we cannot wait until that time. So we can use shutdown command in such cases. For example, if you want to shut down the computer at 2:12 pm then you can use the following command in your ubuntu box: sudo shutdown -h 14:12 "Going to Shutdown at 2:12 pm"

A .nrg file is image file format of Nero Burning ROM.  installing .nrg to .iso converter sudo apt-get install nrg2iso  Usage: nrg2iso image.nrg image.iso

Once I had to look for command line alternatives to restore items from trash since I was not able to do it from the GUI. mv ~/.local/share/Trash/files/myFile.doc ./

rm -rf /home/username/.local/share/Trash/info/*  rm -rf /home/username/.local/share/Trash/files/*