HOWTO+-+Create+a+Large+Dummy+File+in+Linux

Using the dd command:

code format="bash" dd if=/dev/zero of=dummyzeros bs=1000000000 count=1 1+0 records in 1+0 records out 1000000000 bytes (1.0 GB) copied, 23.6414 s, 42.3 MB/s

du -h dummyzeros 954M   dummyzeros

dd if=/dev/zero of=dummyzeros bs=1024000 count=10 10+0 records in 10+0 records out 10240000 bytes (10 MB) copied, 0.0782019 s, 131 MB/s

du -h dummyzeros 9.8M   dummyzeros

dd if=/dev/urandom of=dummyrandom bs=1024000 count=100 100+0 records in 100+0 records out 102400000 bytes (102 MB) copied, 16.3029 s, 6.3 MB/s

du -h dummyrandom 98M    dummyrandom

code