Comments on: How to Backup or Clone Linux Partitions Using ‘cat’ Command

By: Bob Brunius

Bob Brunius — Sun, 30 May 2021 17:48:25 +0000

BTW running:

$ sudo dd if=/dev/sda2  of=/dev/sdb1

had no permission issue and it ran ok for me.

By: Bob Brunius

Bob Brunius — Sun, 30 May 2021 17:41:21 +0000

I'm trying to do this as shown but I'm getting "permission denied" when running:

$ sudo cat /dev/sda2 > /dev/sdb1

By: Ravi Saive

Ravi Saive — Thu, 02 Mar 2017 05:35:25 +0000

In reply to dzaczek.

@Daczek,

I agree with you, we should change the uuid after creating a clone or copying disk and thanks for sharing the commands for changing the UUID in Linux. Hope it will help other users..

By: dzaczek

dzaczek — Wed, 01 Mar 2017 15:58:24 +0000

Hi, Nice tutorial but when we cloning partition/disk must remember about change uuid after copy. If disk will stay connected to machine after reboot we can have problem with mount by uuid. Sometimes we want to have the same uuid but you must remember to remove the disk from the server for xfs file system.

# xfs_admin -U {uuid} {device}

for ext file systems

# tune2fs /dev/{device}  -U time

For reiserfs

# tunefs.reiserfs -i {uuid} {device}

By: James pinkerton

James pinkerton — Thu, 07 Jul 2016 07:09:29 +0000

Morning Ravi, I see what cat does and just wondered why when making a bootable usb pen-drive the code listed on most web-sites uses dd if=whatever.iso of=/dev/sdb, I read that dd copies saved files byte by byte probably from ascii coded text, how does cat work. I am a novice user of Linux, currently taking in all knowledge to gain my ” Red-Hat CSA”. I use your website daily, very informative chunk size blocks of data. Thank you