Quickly Make A Large File In Ubuntu

If you want to create a 10 GB File, follow the steps below listed

root@ubuntu:~# time dd if=/dev/zero of=large bs=10G count=1

dd: memory exhausted by input buffer of size 10737418240 bytes (10 GiB)

real    0m0.002s

user    0m0.000s

sys     0m0.000s

root@ubuntu:~# du -B 1 --apparent-size large

0       large

root@ubuntu:~# du -B 1 large

0       large

root@ubuntu:~# time fallocate -l 10G large

real    0m0.091s

user    0m0.000s

sys     0m0.008s