Using Filters
In UNIX, filters are designed to accept input, process the data, and write the results to standard output. Think of a filter as a mechanical filter that filters data flowing through it. Using a filter, you can select which data to allow through the filter. grep is classified as a filter. Earlier in this chapter, I described how to use grep to search for a string in a text file and to display the lines containing that string. Now I’ll describe how to use grep to filter data going to standard output.
The ls –l /usr/bin command displays the following output:
-r-xr-xr-x 1 root bin 21096 Nov 8 2001 acctcom -r-xr-xr-x 40 root bin 5420 Nov 8 2001 adb -r-xr-xr-x 1 root bin 10256 Nov 8 2001 addbib -r-s--x--x 1 root sys 350748 Nov 5 ...
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