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By Shyr H.J., Yu S.S.

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To eliminate this ambiguity between options and arguments, the getopt(3) library routine recognizes the character sequence -- (two hyphens) to mean that this is the end of options. All other command line arguments following are to be interpreted as arguments. Using this rule, we can now easily remove that pesky file: $ rm -- -testfile These conventions hold true for most Linux commands (ignoring the GNU long option extensions). The commands provided by this book’s software all follow these conventions.

Downloading the Source A given branch of the kernel source release can be quite large in terms of a git download. /linux in your home directory: $ cd $ pwd /home/pi $ df . git Cloning into 'linux'... remote: Counting objects: 51221, done. remote: Compressing objects: 100% (48663/48663), done. 22 MiB/s, done. Resolving deltas: 100% (4084/4084), done. Checking out files: 100% (48467/48467), done. If you leave out the --depth 1 option, you will download the entire history. This will take several times longer and occupy much more disk space.

5V) 2. Gnd 3. DIN (data in) 4. CS (load for MAX7219) 5. 3V logic, and will not tolerate higher voltages. There is the fact that DIN, CS (which is LOAD for the MAX7219) and CLK are inputs to the IC. 5V. 3V. Level Converters There is a very good solution available, however, at low cost and minimum of fuss: the 3V to 5V bidirectional level converter shown in Figure 3-2. Figure 3-2. 07 (free shipping), although they can be found for less (make sure you get one that is bidirectional). They might be advertised under different names, but I2C or IIC is almost always mentioned.

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2-Codes and 2-Code Annihilators by Shyr H.J., Yu S.S.

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