Anwendung von RFID-Systemen, 1.Auflage by Christian Kern

By Christian Kern

Die Radio-Frequenz-Identifikation (RFID) dient seit etwa 15 Jahren zur Identifikation von Personen, Objekten und Tieren. Mit der inzwischen intestine entwickelten Technologie k?nnen heute Rationalisierungen in vielen Wirtschaftsbereichen erreicht werden. Das Buch bietet eine Darstellung bestehender Anwendungen und Technologiegrundlagen sowie eine Beschreibung der M?glichkeiten und Grenzen von RFID. Es soll dem Projektleiter zugleich als Leitfaden f?r die Auswahl geeigneter RFID-Systeme dienen. Eine Abgrenzung von Funktionseinheiten ist in einer Systembetrachtung enthalten. Der Leser wird in die Lage gebracht, eine RFID-Anwendung von der Idee bis zur Praxis aufzubauen und die richtigen Ressourcen zusammenzustellen. Im Anhang aufgef?hrt sind: Firmen, die im Bereich RFID t?tig sind, eine ?bersicht zu bestehenden Anwendungen in verschiedenen Branchen sowie Gremien und Institute, die sich mit RFID besch?ftigen und kompetente Beratung geben k?nnen.

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Normally, each separate line constitutes a different command, but an escape at the end of a line escapes the newline character, and the command sequence continues on to the next line. (cd /source/directory && tar cf − . ) | \ (cd /dest/directory && tar xpvf −) # Repeating Alan Cox's directory tree copy command, # but split into two lines for increased legibility. # As an alternative: tar cf − −C /source/directory | tar xpvf − −C /dest/directory # See note below. ) If a script line ends with a |, a pipe character, then a \, an escape, is not strictly necessary.

Chapter 6. Quoting 36 Chapter 7. Tests Every reasonably complete programming language can test for a condition, then act according to the result of the test. Bash has the test command, various bracket and parenthesis operators, and the if/then construct. 1. Test Constructs • An if/then construct tests whether the exit status of a list of commands is 0 (since 0 means "success" by UNIX convention), and if so, executes one or more commands. • There exists a dedicated command called [ (left bracket special character).

3" # Error. 3") echo "b = $b" # b=1 Use bc in scripts that that need floating point calculations or math library functions. bitwise operators. The bitwise operators seldom make an appearance in shell scripts. Their chief use seems to be manipulating and testing values read from ports or sockets. "Bit flipping" is more relevant to compiled languages, such as C and C++, which run fast enough to permit its use on the fly. bitwise operators << Chapter 8. Operations and Related Topics 54 Advanced Bash−Scripting Guide bitwise left shift (multiplies by 2 for each shift position) <<= "left−shift−equal" let "var <<= 2" results in var left−shifted 2 bits (multiplied by 4) >> bitwise right shift (divides by 2 for each shift position) >>= "right−shift−equal" (inverse of <<=) & bitwise and &= "bitwise and−equal" | bitwise OR |= "bitwise OR−equal" ~ bitwise negate !

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