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mireille ~/test> cat file2
Thu Jun 10 11:10:34 CEST 2004
11:10:51 up 21 days, 21:21, 57 users, load average: 0.04, 0.16, 0.26
5.3. Filters
When a program performs operations on input and writes the result to the standard output, it is called a filter. One of the most common uses of filters is to restructure output. We'll discuss a couple of the most important filters below.
