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Full Discussion: Extracting words and lines based on keywords
Top Forums Shell Programming and Scripting Extracting words and lines based on keywords Post 302818861 by seemad on Sunday 9th of June 2013 03:54:36 PM
Old 06-09-2013
Extracting words and lines based on keywords
Hello!

I'm trying to process a text file and am stuck at 2 extractions. Hoping someone can help me here:

1. Given a line in a text file and given a keyword, how can I extract the word preceeding the keyword using a shell command/script?

For example: Given a keyword "world" in the line:
"This really beautiful world goes round and round".

How can I extract the word "beautiful"? it can occur either as 2 separate terms as above "Beautiful World" or a conjoined word as "Beautiful-world". I need to extract Beautiful in either of the cases.
[I tried to get the position of the word, "World" and tried to extract the word before that. But it did gave me the entire piece of string from the beginning. However, I only need to extract the word "Beautiful"
]


2. Given a keyword, say, "design", how can I extract the first paragraph under it?
For example, in the text file, I have the below:
Design:
"This is the design for the experiment to be conducted in July. The requirements have already been signed off by the business. Prior to starting the design phase, ensure that the current design document is available for all departments."

para 2

para 3

I need to extract only the paragraph immediately below design. Is there a way I can do this using Shell commands/script?

Thanks so much in advance.

Regards,
seemad
 

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LEARN ABOUT SUSE

extract

EXTRACT(1)                                                    General Commands Manual                                                   EXTRACT(1)

NAME

       extract - determine meta-information about a file

SYNOPSIS

       extract [ -bghLnvV ] [ -H hash-algorithm ] [ -i ] [ -l library ] [ -p type ] [ -x type ] file ...

DESCRIPTION

       This manual page documents version 0.6.0 of the extract command.

       extract  tests  each  file  specified  in the argument list in an attempt to infer meta-information from it.  Each file is subjected to the
       meta-data extraction libraries from libextractor.

       libextractor classifies meta-information (also referred to as keywords) into types. A list of all types can be obtained with the -L option.

OPTIONS

       -b      Display the output in BiBTeX format.

       -g      Use grep-friendly output (all keywords on a single line for each file).  Use the verbose option to print the filename  first,  fol-
               lowed  by  the keywords.  Use the verbose option twice to also display the keyword types.  This option will not print keyword types
               or non-textual metadata.

       -h      Print a brief summary of the options.

       -i      Run plugins in-process (for debugging).  By default, each plugin is run in its own process.

       -l libraries
               Use the specified libraries to extract keywords. The general format of libraries  is  .I  [[-]LIBRARYNAME[:[-]LIBRARYNAME]*]  where
               LIBRARYNAME  is a libextractor compatible library and typically of the form .Ijpeg. The minus before the libraryname indicates that
               this library should be removed from the existing list.  To run only a few selected plugins, use -l in combination with -n.

       -L      Print a list of all known keyword types.

       -n      Do not use the default set of extractors (typically all standard extractors, currently mp3, ogg, jpg, gif, png, tiff,  real,  html,
               pdf and mime-types), use only the extractors specified with the .B -l option.

       -p  type
               Print  only  the  keywords  matching  the specified type. By default, all keywords that are found and not removed as duplicates are
               printed.

       -v      Print the version number and exit.

       -V      Be verbose.  This option can be specified multiple times to increase verbosity further.

       -x  type
               Exclude keywords of the specified type from the output. By default, all keywords that are found and not removed as  duplicates  are
               printed.

SEE ALSO

       libextractor(3) - description of the libextractor library

EXAMPLES

       $ extract test/test.jpg
       comment - (C) 2001 by Christian Grothoff, using gimp 1.2 1
       mimetype - image/jpeg

       $ extract -V -x comment test/test.jpg
       Keywords for file test/test.jpg:
       mimetype - image/jpeg

       $ extract -p comment test/test.jpg
       comment - (C) 2001 by Christian Grothoff, using gimp 1.2 1

       $ extract -nV -l png.so -p comment test/test.jpg test/test.png
       Keywords for file test/test.jpg:
       Keywords for file test/test.png:
       comment - Testing keyword extraction

LEGAL NOTICE

       libextractor and the extract tool are released under the GPL.  libextractor is a GNU package.

BUGS

       A couple of file-formats (on the order of 10^3) are not recognized...

AUTHORS

       extract  was  originally  written  by  Christian  Grothoff  <christian@grothoff.org> and Vidyut Samanta <vids@cs.ucla.edu>. Use <libextrac-
       tor@gnu.org> to contact the current maintainer(s).

AVAILABILITY

       You can obtain the original author's latest version from http://www.gnu.org/software/libextractor/

libextractor 0.6.0                                                 Dec 20, 2009                                                         EXTRACT(1)
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