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commandlinefu.com is the place to record those command-line gems that you return to again and again.

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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

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Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Creating ISO Images from CDs/DVDs

Terminal - Creating ISO Images from CDs/DVDs
dd if=/dev/cdrom of=~/cd_image.iso
2011-09-24 15:27:04
User: eastwind
Functions: dd
Creating ISO Images from CDs/DVDs

create an iso from your cd/dvd-rom device . You need to umount /dev/cdrom

before using the cli


There is 1 alternative - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

This is not a good way to create ISO images from CDs, as dd(1) provides no error checking when creating the image. Instead, you should be using:


Comment by atoponce 295 weeks and 4 days ago

I always add something like bs=1M for performance. At least once I dumped a harddrive with the default block size and the performance was awful. Can anyone verify the performance difference in this case?

Comment by wipu 295 weeks and 3 days ago

If your block size matches the block size of your block device, then you will maximize performance with dd(1). Again though, dd(1) is not the tool for this job, and readom(1) will read the optical media as fast as possible, while maintaining the checksums.

Comment by atoponce 295 weeks and 3 days ago

Your point of view

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