Command to generate large dummy files

[illingn]

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Hi,
I'd like to create some large binary files to test download speeds from my Suse10 server. I know there's a command to do it...but I can't for the life of me remember what it is.
Ideally, I want to create files of 10Mb, 50Mb, 100Mb, 500Mb and 1Gb.

Can anyone help?

Thanks!

[antidrugue]

cat /dev/urandom > test.bin

[illingn]

Thanks. How do I set the sizes....?

[antidrugue]

You can do that a few ways, with:
/dev/zero (very fast)
/dev/random
/dev/urandom (chunks of size you can decide in /proc/sys/kernel/random/pool_size)

A command like that:

time dd if=/dev/zero of=test.bin bs=1000000000 count=1

will generate a 1G file (and tell you how much time it took to do so).

[illingn]

Fantastic! Just what I needed. Many thanks.