How to make file
 

i'm so confuse , how to make file but that file have size. Example file1 is 2M, file2 1M. give me example for it. I have read manual of dd but file not created, my command is dd bs=2M

try:-

dd if=/dev/zero of=your_file_name bs=512 count=4000

that will make a 2Mbyte file full of zeroes.

try man dd for more info.