I'm not trying to be snide here, but you would have known how to use script had you read the man page. I'm surprised (and somewhat appalled) that you'd run a command that someone suggested to you without at least scanning the documentation on the command. Otherwise someone might accidentally suggest you do something as destructive (but not as obvious) as:

ls -al | mkfs /dev/hda1 | grep 'pwned!'
[download]

...roboticus