c# barcode creator B-2 . Command Symbols in C#.NET

Draw Universal Product Code version A in C#.NET B-2 . Command Symbols

Appendix B
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In order to work together better, many command-line programs follow a set of conventions that control their interaction:
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By default, programs take all of their input as lines of text typed at the keyboard. But input in the same format also can be redirected from a file or any device capable of sending lines of text. By default, programs send all of their output to the screen as lines of text. But output in the same format also can be redirected to a file or another line-oriented device, such as a printer.
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Programs are written to set a number called a return value when they terminate, to indicate the results of the program. When programs are written according to these rules, you can use the symbols in Table B-2 to control a program s input and output, and to connect or chain programs together.
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Table B-2 . Command Symbols
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< > >> | & && || ^ ( and )
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Redirects input Redirects output Appends redirected output to existing data Pipes output Separates multiple commands in a command line Runs the command after && only if the command before && is successful Runs the command after || only if the command before || fails Treats the next symbol as a character Groups commands
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Using Commands 1039
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The Redirection Symbols
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As in MS-DOS and Unix, Command Prompt sessions in Windows Vista allow you to override the default source for input (the keyboard) or the default destination for output (the screen). Redirecting Output To redirect output to a file, type the command followed by a greater than sign (>) and the name of the file. For example, to send the output of the Dir command to a file instead of the screen, type the following:
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dir /b *.bat > batch.lst
This command line creates a file called Batch.lst that contains the names of all the .bat files in the current folder. Using two greater than signs (>>) redirects output and appends it to an existing file. For example:
Appendix B
dir /b *.cmd >> batch.lst
This command line appends a list of .cmd files to the previously created file containing .bat files. (If you use >> to append to a file that doesn t exist, Windows Vista creates the file.) Redirecting Input To redirect input from a file, type the command followed by a less than sign (<) and the name of the file. The Sort and More commands are examples of commands that can accept input from a file. The following example uses Sort to filter the file created with the Dir command above.
sort < batch.lst
The input file, Batch.lst, contains a list of .bat files followed by a list of .cmd files (assuming you have some of each in the current folder). The output to the screen is the same list of files sorted alphabetically by file name.
Redirecting Input and Output
You can redirect both input and output in a command line. For example, to use Batch.lst as input to the Sort command and send its output to a file named Sorted.lst, type the following:
sort < batch.lst > sorted.lst
Standard Output and Standard Error Programs can be written to send their output either to the standard output device or to the standard error device. Sometimes programs are written to send different types of output to each device. You can t always tell which is which because, by default, both devices are the screen.
1040 Appendix B Working with the Command Prompt
The Type command illustrates the difference. When used with wildcards (something you can t do with the Type command in MS-DOS or Windows 9x), the Type command sends the name of each matching file to the standard error device and sends the contents of the file to the standard output device. Because they both go to the screen, you see a nice display with each file name followed by its contents. However, if you try to redirect output to a file like this:
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