June 2003
Beginner to intermediate
944 pages
43h 1m
English
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Name
sum
Synopsis
sum [options] files
Calculate and print a checksum and the number of (1KB) blocks for file. If no files are specified, or file is -, read from standard input. Useful for verifying data transmission.
Options
- -r
The default setting. Use the BSD checksum algorithm.
- -s, --sysv
Use alternate checksum algorithm as used on System V. The blocksize is 512 bytes.
- --help
Print a help message and then exit.
- --version
Print the version number and then exit.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.