asp.net barcode scanner $ ps PID 523 567 570 TTY tty24 tty24 tty24 TIME 0:05 0:01 0:00 COMMAND sh lpr ps in Software

Creator QR Code in Software $ ps PID 523 567 570 TTY tty24 tty24 tty24 TIME 0:05 0:01 0:00 COMMAND sh lpr ps

$ ps PID 523 567 570 TTY tty24 tty24 tty24 TIME 0:05 0:01 0:00 COMMAND sh lpr ps
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You can then reference the system process number in a kill command. Use the process number without any preceding percent sign. The next example kills process 567:
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$ kill 567
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You can suspend a job and stop it with the CTRL-Z keys. This places the job to the side until it is restarted. The job is not ended; it merely remains suspended until you want to continue. When you're ready, you can continue with the job in either the foreground or the background using the fg or bg command. The fg command restarts a suspended job in the foreground. The bg command places the suspended job in the background. At times, you may need to place a currently running job in the foreground into the background. However, you cannot move a currently running job directly into the background. You first need to suspend it with CTRL-Z, and then place it in the background with the bg command. In the next example, the current command to list and redirect .c files is first suspended with a CTRL-Z. Then that job is placed in the background.
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$ cat *.c > myprogs ^Z $ bg
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Filters and Regular Expressions
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Filters are commands that read data, perform operations on that data, and then send the results to the standard output. Filters generate different kinds of output, depending on their task. Some filters only generate information about the input, other filters output selected parts of the input, and still other filters output an entire version of the input, but in a modified way. Some filters are limited to one of these, while others have options that specify one or the other. You can think of a filter as operating on a stream of data- receiving data and generating modified output. As data is passed through the filter, it is analyzed, screened, or modified. The data stream input to a filter consists of a sequence of bytes that can be received from files, devices, or the output of other commands or filters. The filter operates on the data stream, but it does not modify the source of the data. If a filter receives input from a file, the file itself is not modified. Only its data is read and fed into the filter. The output of a filter is usually sent to the standard output. It can then be redirected to another file or device, or piped as input to another utility or filter. All the features of redirection and
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pipes apply to filters. Often data is read by one filter and its modified output piped into another filter. Note Data could easily undergo several modifications as it is passed from one filter to another. However, it is always important to realize the original source of the data is never changed. Many utilities and filters use patterns to locate and select specific text in your file. Sometimes, you may need to use patterns in a more flexible and powerful way, searching for several different variations on a given pattern. You can include a set of special characters in your pattern to enable a flexible search. A pattern that contains such special characters is called a regular expression. Regular expressions can be used in most filters and utilities that employ pattern searches such as Ed, sed, awk, grep, and egrep. Tip Although many of the special characters used for regular expressions are similar to the shell wildcard characters, they are used in a different way. Shell wildcard characters operate on filenames. Regular expressions search text. In Linux, as in UNIX, text files are organized into a series of lines. For this reason, many editors and filters are designed to operate on a text file line by line. The first UNIX editor, Ed, is a line editor whose commands reference and operate on a text file one line at a time. Other editing utilities and filters operate on text much the same way as the Ed line editor. In fact, the Ed editor and other editing filters use the same set of core line editing commands. The editing filters such as sed and diff use those same line editing commands to edit filter input. An edit filter receives lines of text as its input and performs line editing operations on them, outputting a modified version of the text. Three major edit filters exist: tr, which translates characters; diff, which outputs editing information about two files; and sed, which performs line editing operations on the input. Table 11-4 lists the different editing filters.
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