$ for i in {1..3}; do dd if=/dev/zero of=/path/$i bs=1m count=1; done
or,
$ for i in {1..3}; do mkfile 1m /path/$i; done

C:\>for /L %x in (1,1,3) do fsutil file createnew %x 1048576

• mkfile can generate sparse files with the -n option.
• The Windows for loop set is (start,step,end).
• See also Generate Files with Random Content and Size in Bash, which introduces this script:
  no_of_files=10;
  counter=1;
  while [[ $counter -le $no_of_files ]];
   do echo Creating file no $counter;
    dd bs=1024 count=$RANDOM skip=$RANDOM if=/dev/sda of=random-file.$counter;
    let "counter += 1";
   done

/nix | Nov 13, 2009