create file under linux

It is possible to create files of arbitrary size on a linux machine using the dd command. Here is an example:

$ cd /tmp
$ dd if=/dev/zero of=bigfile bs=1024 count=1048576 

This will create a file of size 1024 * 1048576 bytes (or 1 GB). In this command

    * if - input file
    * of - output file or the file to be created
    * bs - block size in bytes
    * count - # of blocks of size bs