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Randomly create files and folders size of in 1M, 10M, 100M, 1G, 10G

I have searched a lot but couldn't find a solution for this.

Insida a folder, how could I create random files and folders that will be size of in 1M, 10M, 100M, 1G, 10G. Each created folders also needs to have a randomly created file in it.

Solution

  • You could use dd with different file sockets, e.g. /dev/random or /dev/zero.

    This will create a 2MB file with random data in it:

    dd if=/dev/urandom of=file.out bs=1M count=2

    Or create a 1MB file from /dev/zero:

    dd if=/dev/zero of=file.out bs=1024 count=0 seek=1024

    There are a lot of examples out there, just search for "linux dd create file size". This should be wrapped in a script that will create the directories and files for you. I would think of something like this.

    #!/bin/bash
#create files of 1, 10, 100 and 1000MB in size
for fSize in 1 10 100 1000
do
#create a file for size 1MB*fSize
dd if=/dev/zero of=file.out bs=1024 count=0 seek=$((1024*fSize))
done

    Combined with another script that will create the directories and another fSize loop it should do what you want.