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Create a big file on Linux

Written byPhuoc Nguyen
Command Line
17 May, 2021
Sometimes we need to have a random file of given size. We can name some common examples such as
  • Test the file upload functionality
  • Test if the application is able to handle a large set of data
On Linux we can create an empty file of particular size with the `dd` command. The following command creates `sample.txt` file of `1GB`:
$ dd if=/dev/urandom of=sample.txt bs=1G count=1
The file size is the result of `bs * count` in bytes.

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Phước Nguyễn