dd if=/dev/zero of=filename bs=$((1024*1024)) count=$((10*1024))

yes abcdefghijklmnopqrstuvwxyz0123456789 > largefile

dd if=/dev/zero of=bigfile1 bs=10000000000 count=512

dd if=/dev/zero of=zeros bs=1M

dd if=/dev/zero of=zeros bs=1M count=10240

ps aux | grep dd

kill -USR1 PID