Making a bootable pen drive in one command

 Well you can make one in a single command and it works like a charm.  Here's how :

1) plug in your pen drive
2) Run dmesg and check the drive letter (identifier) ( eg /dev/sdb)
3) Run the following command :

dd if=ubuntu.iso  of=/dev/sdb  bs=4M ; sync 

Note : if is your iso file .  DONOT append any trailing number to the pen drive

Thats it ...