Filtering lines in a text file


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There's a text file with lines of the form IP:Port
How to filter out, leaving only the lines starting with 10.* 172.*?
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7 Answers

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Write on icq: 559343705 will write for you for thank you
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grep "^10." ip.txt?
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If you are using Windows and the file is not very big, export it to Excel and there are already sort and filter.
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Use regular expressions if you are familiar with them.
If you are interested in a software implementation, it all depends on your programming language.
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grep (or findstr under Windows)
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Suggest to use perl, though, and in any language like C++ it would be a few lines
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cat + grep?
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