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Linux Shell Scripting Cookbook by Sarath Lakshman

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Generating files of any size

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.

How to do it...

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 stdin

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