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Top Forums Shell Programming and Scripting Performing extractions on web source page Post 302550921 by agama on Sunday 28th of August 2011 07:26:05 PM
Old 08-28-2011
It would be helpful to see the original line that you extract with grep, and the original sed.

I can only guess, but it sounds like there might be two instances of one of the words. Consider this line of text:

Code:
This text is a sample for the use of pattern matching in text

If the words that you are looking to capture things between are text and pattern, and you use the set of sed replacements shown below, you'll get nothing on the output:

Code:
s/.*text//; s/pattern.*//

The reason this produces nothing as output is because the first match matches the whole line and deletes it.

If you are certain that word two only appears once on the line, then reversing the sed substitution commands will help, but it's not foolproof.

And, you don't need to cat a file to sed. Sed is capable of reading the file and thus you'll reduce overhead:

Code:
sed 's/foo/bar/' input-flie >new-file

This User Gave Thanks to agama For This Post:
 

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vlatai(1L)																vlatai(1L)

NAME
vlatai - Lojban word analyzer SYNOPSIS
vlatai [ -v ] [ word ] DESCRIPTION
vlatai is a program that reads a list of Lojban words from standard input, one word per line. In its usual mode, it writes a single output line for each input line, advising of which kind of Lojban word the input line is. If the input word has cmavo prefixed onto it, vlatai shows the individual cmavo and the base word itself. In the verbose mode (obtained using -v), the workings of the internal state machines used for scanning the word are exposed. This may give some insight into where an error lies on words that can't be parsed, especially if the output is used in conjuction with the report files built during the compilation process. Note that vlatai is primarily a testbench for the word categorizer/splitter inside jbofihe. vlatai is not fully supported or documented as a stand-alone program. OPTIONS
-v Verbose; show lots of information about the evolution of the internal state word The word to check. If no 'word' argument is supplied, the program reads words from standard input, one word per line (with no whitespace around it.) REFERENCES
http://go.to/jbofihe Home page for the jbofihe project (of which cmafihe is part) http://www.lojban.org/ Home page of the Lojban community http://www.rrbcurnow.freeuk.com/lojban/ My Lojban page. AUTHOR
Richard Curnow <rpc@myself.com> December 2000 vlatai(1L)
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