creating file of 1MB using shell command? - Shell Programming and Scripting

vijaya2006 · #1 (**permalink**) 03-29-2006

Hi everybody in the forum,

I want to create an empty file of say some 1MB ,i mean at the command line itself.How is this possible??????EEK!

vino · #2 (**permalink**) 03-29-2006

Try this.

Code:

dd if=/dev/zero of=output.file bs=1024 count=1024

It will be filled with /dev/zero's

vijaya2006 · #3 (**permalink**) 04-04-2006

Hi Thanks for the reply....
I would like to be explained in detail

vino · #4 (**permalink**) 04-04-2006

Look into man dd. Or better yet info dd

matrixmadhan · #5 (**permalink**) 04-04-2006

Quote:

Originally Posted by vino

Try this.

Code:

dd if=/dev/zero of=output.file bs=1024 count=1024

It will be filled with /dev/zero's

this is just a suggestion,
when generating files of huge size,
it is better you attack from the block size thereby reducing the count

for a 1 MB file,
dd if=/dev/zero of=output.file bs=1024 count=1024
time taken = 0.13 s
dd if=/dev/zero of=output.file bs=1048576 count=1
time taken = 0.08 s

it is just a difference of (0.13 - 0.08) s

but consider generating some 200 MB files
attacking block size would surely provide a difference.

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