Archive for March 7th, 2006

More on shred

Interesting timing… following on the heels of my rather long entry regarding using gpg to encrypt a file and shred to securely erase the original, ‘s CLI Magic column has an article detailing securely deleting files with shred

Deleting a file with the rm command merely adds a file’s data blocks back to the system’s free list. A file can be restored easily if its “freed” blocks have not been used again. shred repeatedly overwrites a file’s space on the hard disk with random data, so even if a data recovery tool finds your file, it will be unreadable. By default, shred does not delete a file, but you can use the -u or –remove switch to delete it.


By default shred overwrites a file 25 times with random data. You can increase or decrease the number of repetitions using the -n switch. For instance, shred -n 5 -v visit_sites.txt would overwrite the file visit_sites.txt five times and show you the the progress (-v).

CLUE meeting tonight!

Colorado Linux Users and Enthusiasts meeting tonight!

Next Meeting: 7 March 2006, 6:30 PM

Location: Oracle Building 2, Room 1250

Main Topic: 7:00 PM Linux Laptop Charity, with Peter Kuykendall

Peter will talk about a project that he thought up about a month ago. He calls it “Laptops for Flat Tops”. The idea is to take used, surplus laptop computers that are currently gathering dust in basements, garages, and closets, and press them into useful service for soldiers overseas. This will enable them to communicate with their friends and families, read the news, play games, and just generally stay connected with the real world. He believes that this can be done with little or no cash outlay, just donations of services such as shipping and equipment such as “obsolete” laptop and desktop PCs.

One paramount goal of this project is to ensure that no one person needs to contribute a whole lot of time or money or anything else. This makes contributing easy and fun without being overwhelming, which in turn opens the door to a whole lot of participants.

We need volunteers who are willing to be leaders in the following areas:

* Development of software bundles for the laptops and servers. This is really just aggregating existing Linux and other free software.
* Acquisition of used laptops. Ancient 1995 vintage is OK for web surfing and email. Newer models allow video phone service!
* Acquisition of used desktop machines (Pentium 500 or better, for use as servers)
* Acquisition of miscellaneous networking gear (10-base-T, 802.11b, whatever)
* Loading of software bundles into used laptops
* Shipping (possible shippers include US military, as well as commercial shippers)
* Liaison with the US military, so that we can get this stuff allowed on base, along with a place to put it, power, permission to connect to their Internet connection, etc.
* People who currently live overseas or are interested in travelling overseas to coordinate installation.
* Liaison with existing charities.

Some thoughts on likely software bundles: Run a very thin client. The smallest machines will be 486 class, 4 MB RAM, and just a floppy. Amazingly, that’s still useful. It would be great to go completely diskless, but I don’t *think* that any of the old laptops can initialize a PCMCIA NIC without help from something on a disk.

Pete is an electrical engineer who has been working mostly in embedded systems for about 25 years. He currently works on satellite TV piracy issues for a subsidiary of EchoStar.

Desktop Linux 101: 6:30 PM OpenOffice Impress with Todd Trichler from Oracle’s Linux Technology Center

Profile picI am a 40-ish uber-geek, Daoist and family man. Blessed to have one incredible wife and three wonderful kiddos. Dao has been kind to me.

March 2006
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