How can I find out the format of an external hard drive?

[totalchamp]

First of all, apologies for this painfully newbie question.

I've got this hard drive that I know that is formatted to either ext3 or ext4, but I want to find out which format it is. I'm unfamiliar with many commands, I tried 'fdisk -l' but it didn't yield any useful information to me. Is there a command wherein I can easily find out the format of disks?

[glennzo]

There are probably better ways but this works.

[glenn@leonardo ~]$ blkid
/dev/sda1: UUID="54FCB540FCB51CE4" LABEL="System Reserved" TYPE="ntfs" 
/dev/sda2: UUID="62D4BE72D4BE47D5" TYPE="ntfs" LABEL="" 
/dev/sda3: UUID="d555734e-fe8c-4a0e-aff8-3dc3b16188bc" TYPE="ext4" 
/dev/sda5: LABEL="/" UUID="2cf8eaa5-8862-44a0-a6de-f6673eff7d4f" SEC_TYPE="ext2" TYPE="ext3" 
/dev/sda6: LABEL="SWAP-sda6" TYPE="swap"

[totalchamp]

Ah it definitely did. Thank you glennzo!

[glennzo]

You're welcome. A functional but probably not the most techie way to find out. It gets the job done.