On FreeBSD:
# sudo /etc/rc.d/sysctl reload
On Linux:
# sudo sysctl -p /etc/sysctl.conf
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On FreeBSD:
# sudo /etc/rc.d/sysctl reload
On Linux:
# sudo sysctl -p /etc/sysctl.conf
Here is how to create a file with random 1s and 0s.
Example 1GB File:
dd if=/dev/urandom of=test1 bs=1M count=1024
Example 10GB File:
dd if=/dev/urandom of=test1 bs=1M count=10240