A filter is a computer program to process a data stream. Some operating systems such as Unix are rich with filter programs. Even Windows has some simple filters built in to its command shell, most of which have significant enhancements relative to the similar filter commands that were available in MS-DOS.

Just as in Unix, such a filter usually gets most of its data from standard input (the main input stream) and writes its main results to standard output (the main output stream). The command syntax for getting data from a device or file other than standard input is the input operator ("<"). Similarly, to send data to a device or file other than standard output is the output operator (">"). To append data lines to an existing output file, one can use the append operator (">>").

The similarity with Unix extends to filters used as elements of pipelines. The pipe operator ("|") on a command line signifies that the main output of the command to the left is passed as main input to the command on the right. From the early days of DOS based computers, the two classic filters are find and sort.

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http://tinyurl.com/3os5y5 K9 Web Protection - Free Internet Filtering and Parental Controls Software
desk_stage (desk_stage) Wed, 09 Dec 2009 12:02:12 -0000
http://tinyurl.com/3os5y5 K9 Web Protection - Free Internet Filtering and Parental Controls Software
Cblatt says Ethiopia uses the same internet monitoring/filtering software as China. I had no idea.
devonwhittle (Devon Whittle) Wed, 09 Dec 2009 09:33:32 -0000
Cblatt says Ethiopia uses the same internet monitoring/filtering software as China. I had no idea.
RT @danwei: Gay conversion therapy and filtering software: Jonathan in China talks about the filter on gay websites announced y... http: ...
returnjon (Jonathan Crowder) Wed, 09 Dec 2009 06:29:24 -0000
RT @danwei: Gay conversion therapy and filtering software: Jonathan in China talks about the filter on gay websites announced y... http: ...
Internet filtering software to protect children during the school ... http://bit.ly/5zcvAl
kidsvpredators (Joe Green) Wed, 09 Dec 2009 05:34:11 -0000
Internet filtering software to protect children during the school ... http://bit.ly/5zcvAl
i remember when mom of 17yr old friend wanted to install filtering software on his laptop, and he was: "that's ok, mom, thanks anyway..."
TariAkpodiete (TariAkpodiete) Wed, 09 Dec 2009 04:37:26 -0000
i remember when mom of 17yr old friend wanted to install filtering software on his laptop, and he was: "that's ok, mom, thanks anyway..."
RT @danwei: Gay conversion therapy and filtering software: Jonathan in China talks about the filter on gay websites announced y... http: ...
taweili (David Li) Wed, 09 Dec 2009 04:22:21 -0000
RT @danwei: Gay conversion therapy and filtering software: Jonathan in China talks about the filter on gay websites announced y... http: ...

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