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The Linux Command Line by William E. Shotts Jr.

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Extra Credit

It’s often useful to verify the integrity of an ISO image that we have downloaded. In most cases, a distributor of an ISO image will also supply a checksum file. A checksum is the result of an exotic mathematical calculation resulting in a number that represents the content of the target file. If the contents of the file change by even one bit, the resulting checksum will be much different. The most common method of checksum generation uses the md5sum program. When you use md5sum, it produces a unique hexadecimal number:

md5sum image.iso
34e354760f9bb7fbf85c96f6a3f94ece  image.iso

After you download an image, you should run md5sum against it and compare the results with the md5sum value supplied by the publisher.

In addition to checking ...

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