How to create a large file for testing purpose ?

Issue :

How can a large file, say 1GB, for some testing purposes be created?

Solution :

Use the following command :

dd if=/dev/zero of= filename bs=1024 count=1024number of 0′s

Replace ‘filename’ with the actual filename.
Replace ‘number of 0′s’ with the required number of 0′s

For example,
One ’0′ for 10MB , two for 100 MB and so on..

For the above scenario (file of size 1GB), use the following command :

dd if=/dev/zero of=file.test bs=1024 count=1024000