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  1. or download this
    system("dd if=/dev/zero of=$SIZE bs=1M count=0 seek=$SIZEMB &>/dev/nul
+l})';
# prints to STDERR:
10+0 records in
10+0 records out
10485760 bytes (10 MB) copied, 0.00426433 s, 2.5 GB/s
  2. or download this
    system("dd if=/dev/zero of=$SIZE bs=1M count=0 seek=$SIZEMB &>/dev/nul
+l})';
# prints nothing