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Top Forums Shell Programming and Scripting BASH. Need to extract some numbers and take the average Post 302367419 by slackjack on Monday 2nd of November 2009 02:14:28 PM
Old 11-02-2009
Quote:
Originally Posted by Scrutinizer
Something like this? (bash code):
Code:
grep cartons [ab]-* |
{ while read x x x x x eggs x cartons x; do
    (( total_eggs+=eggs ))
    (( total_cartons+=cartons ))
  done
  echo "A total number of $total_eggs eggs in $total_cartons cartons makes an average of $(( total_eggs/total_cartons )) eggs per carton"
}

Code:
$> grep cartons [ab]-*
a-10.txt:number of eggs used is 55 in 4 cartons
a-4.txt:number of eggs used is 97 in 3 cartons
a-6.txt:number of eggs used is 22 in 1 cartons
a-8.txt:number of eggs used is 44 in 9 cartons
b-10.txt:number of eggs used is 87 in 5 cartons
b-4.txt:number of eggs used is 85 in 5 cartons
b-6.txt:number of eggs used is 36 in 6 cartons
b-8.txt:number of eggs used is 88 in 2 cartons

Result:
Code:
A total number of 514 eggs in 35 cartons makes an average of 14 eggs per carton

Hi,

What exactly does the highlighted code do? Also, what if the structure of the string changes? Like if it was:
b-4.txt:85 eggs in 5 cartons

I would be grateful if you could explain how you extracted the numbers.
 

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tracker-extract(1)						   User Commands						tracker-extract(1)

NAME
tracker-extract - Extract metadata from a file. SYNOPSYS
tracker-extract [OPTION...] FILE... DESCRIPTION
tracker-extract reads the file and mimetype provided in stdin and extract the metadata from this file; then it displays the metadata on the standard output. NOTE: If a FILE is not provided then tracker-extract will run for 30 seconds waiting for DBus calls before quitting. OPTIONS
-?, --help Show summary of options. -v, --verbosity=N Set verbosity to N. This overrides the config value. Values include 0=errors, 1=minimal, 2=detailed and 3=debug. -f, --file=FILE The FILE to extract metadata from. The FILE argument can be either a local path or a URI. It also does not have to be an absolute path. -m, --mime=MIME The MIME type to use for the file. If one is not provided, it will be guessed automatically. -d, --disable-shutdown Disable shutting down after 30 seconds of inactivity. -i, --force-internal-extractors Use this option to force internal extractors over 3rd parties like libstreamanalyzer. -m, --force-module=MODULE Force a particular module to be used. This is here as a convenience for developers wanting to test their MODULE file. Only the MOD- ULE name has to be specified, not the full path. Typically, a MODULE is installed to /usr/lib/tracker-0.7/extract-modules/. This option can be used with or without the .so part of the name too, for example, you can use --force-module=foo Modules are shared objects which are dynamically loaded at run time. These files must have the .so suffix to be loaded and must con- tain the correct symbols to be authenticated by tracker-extract. For more information see the libtracker-extract reference documen- tation. -V, --version Show binary version. EXAMPLES
Using command line to extract metadata from a file: $ tracker-extract -v 3 -f /path/to/some/file.mp3 Using a specific module to extract metadata from a file: $ tracker-extract -v 3 -f /path/to/some/file.mp3 -m mymodule ENVIRONMENT
TRACKER_EXTRACTORS_DIR This is the directory which tracker uses to load the shared libraries from (used for extracting metadata for specific file types). These are needed on each invocation of tracker-store. If unset it will default to the correct place. This is used mainly for testing purposes. The default location is /usr/lib/tracker-0.10/extract-modules/. TRACKER_EXTRACTOR_RULES_DIR This is the directory which tracker uses to load the rules files from. The rules files describe extractor modules and their sup- ported MIME types. The default location is /usr/share/tracker/extract-rules/. TRACKER_USE_CONFIG_FILES Don't use GSettings, instead use a config file similar to how settings were saved in 0.10.x. That is, a file which is much like an .ini file. These are saved to $HOME/.config/tracker/ SEE ALSO
tracker-store(1), tracker-sparql(1), tracker-stats(1), tracker-info(1). /usr/lib/tracker-0.10/extract-modules/ /usr/share/tracker/extract-rules/ GNU
July 2007 tracker-extract(1)
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