For various reasons, you may need to generate a file filled with random data. It may be for creating a test file to perform tests, such as an application efficiency test that uses a large file as input, or to test the splitting of files into many, or to create loopback filesystems (loopback files are files that can contain a filesystem itself and these files can be mounted similar to a physical device using the
mount command). It is hard to create such files by writing specific programs. So we use general utilities.
The easiest way to create a large sized file with a given size is to use the
dd command. The
dd command clones the given input and writes an exact copy to the output. Input can be