Building cross reference -- how?

[Walter Dnes]

On Sun, Oct 13, 2013 at 02:14:04AM -0400, William Park wrote
> Hi all,
> 
> I want to build cross reference on certain lines in files.  I can
> extract those lines into a file, say in format
>     filename,...line...
> 
> Now, how do I build cross reference?
> 
> For example, if I have
>     file1, one two three red
>     file2, four five
>     file3, red blue yellow
>     file4, blue one
> Then, cross reference for "red" should give me first line (file1) and
> 3rd line (file3).  And, cross reference for "red one" should give me
> only the first line (file1).  I guess I can do
>     fgrep -e red
>     fgrep -e red | fgrep -e one
> 
> Is there a program, similar to "updatedb" and "slocate"?

  It sounds almost like you want to create a concordance.  Various word
processors (e.g. MS Word) can do it.  A free (as in beer, only; no
source) linux program is available from...
http://www.antlab.sci.waseda.ac.jp/antconc_index.html

  It could probably be done as a 2-pass bash script.  See...
http://stackoverflow.com/questions/9056829/concordance-of-text for a
start.  Pass 1 would be creating the list (don't need the count).  Pass
2 would use the output from Pass 1 as a pattern file.  Something like...

grep -Hno -f <output_file_from_Pass_1> list_of_input_files

-- 
Walter Dnes <waltdnes-SLHPyeZ9y/tg9hUCZPvPmw at public.gmane.org>
I don't run "desktop environments"; I run useful applications
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