Shell script help not sure of next command Post: 303008559

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Homework and Emergencies Homework & Coursework Questions Shell script help not sure of next command Post 303008559 by Don Cragun on Sunday 3rd of December 2017 01:53:24 AM

12-03-2017

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Assuming that the last field in your data is a number of units of that recipe item, are you looking for the highest unit price (e.g. $2.98 for pumpkin pie filling), or are you looking at the highest price based on the unit price and quantity (e.g., $4.45 for 5 potatoes)?

If the latter, it is unfortunate that grep doesn't do arithmetic and that bash doesn't perform floating point calculations. Are you supposed to be learning how to use awk?

Most versions of the sort utility since about 1990 have two ways of specifying which ranges of characters on an input line are to be used as a sort key. Many people (apparently including you) found the old way (+key_start_spec -key_end_spec) confusing. Please look at your system's man page for sort (i.e. issue the command man sort) and look for the -k keydef option description and see if you can more easily specify the unit price field to be used as the sort key. You might also want to look for an option (or keydef flag to reverse the sort order if you want the highest values first instead of last. Note that if you want to sort on two fields, you need to sort keys. For example, if you want to sort with unit prices as the primary key and quantity as the secondary key, you need to use the 3rd field as your primary key and the 4th field as your secondary key. Using the 3rd and 4th fields together as a single sort key won't give you the results you want when sorting numeric fields.

While you're looking at man pages, you might also want to investigate what the head and tail utilities do.

Don Cragun

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text::bibtex::bibsort

Text::BibTeX::BibSort(3pm)				User Contributed Perl Documentation				Text::BibTeX::BibSort(3pm)

NAME

       Text::BibTeX::BibSort - generate sort keys for bibliographic entries

SYNOPSIS

	  # Assuming $entry comes from a database of the 'Bib' structure
	  # (i.e., that it's blessed into the BibEntry class, which inherits
	  # the sort_key method from BibSort):
	  $sort_key = $entry->sort_key;

DESCRIPTION

       "Text::BibTeX::BibSort" is a base class of "Text::BibTeX::BibEntry" for generating sort keys from bibliography entries.	It could in
       principle (and, someday, might) offer a wide range of highly customizable sort-key generators.  Currently, though, it provides only a
       single method ("sort_key") for public use, and that method only pays attention to one structure option, "sortby".

METHODS

       sort_key ()
	   Generates a sort key for a single bibliographic entry.  Assumes this entry conforms to the "Bib" database structure.  The nature of
	   this sort key is controlled by the "sortby" option, which can be either "name" or "year".  (The "namestyle" also has a role, in
	   determining how author/editor names are formatted for inclusion in the sort key.)

	   For by-name sorting (which is how BibTeX's standard styles work), the sort key consists of one of the "author", "editor",
	   "organization", or "key" fields (depending on the entry type and which fields are actually present), followed by the year and the
	   title.  All fields are drastically simplified to produce the sort key: non-English letters are mercilessly anglicized, non-alphabetic
	   characters are stripped, and everything is forced to lowercase.  (The first two steps are done by the "purify_string" routine; see
	   "Generic string-processing functions" in Text::BibTeX for a brief description, and the descripton of the C function
	   "bt_purify_string()" in bt_misc for all the gory details.)

SEE ALSO

       Text::BibTeX::Structure, Text::BibTeX::Bib, Text::BibTeX::BibFormat

AUTHOR

       Greg Ward <gward@python.net>

COPYRIGHT

       Copyright (c) 1997-2000 by Gregory P. Ward.  All rights reserved.  This file is part of the Text::BibTeX library.  This library is free
       software; you may redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-06-02						Text::BibTeX::BibSort(3pm)