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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LEARN ABOUT BSD

sortbib

SORTBIB(1)						      General Commands Manual							SORTBIB(1)

NAME

       sortbib - sort bibliographic database

SYNOPSIS

       sortbib [ -sKEYS ] database  ...

DESCRIPTION

       Sortbib	sorts files of records containing refer key-letters by user-specified keys.  Records may be separated by blank lines, or by .[ and
       .] delimiters, but the two styles may not be mixed together.  This program reads through each database and pulls out key fields, which  are
       sorted  separately.   The  sorted key fields contain the file pointer, byte offset, and length of corresponding records.  These records are
       delivered using disk seeks and reads, so sortbib may not be used in a pipeline to read standard input.

       By default, sortbib alphabetizes by the first %A and the %D fields, which contain the senior author and date.  The -s  option  is  used	to
       specify	new  KEYS.   For  instance, -sATD will sort by author, title, and date, while -sA+D will sort by all authors, and date.  Sort keys
       past the fourth are not meaningful.  No more than 16 databases may be sorted together at one time.  Records  longer  than  4096	characters
       will be truncated.

       Sortbib	sorts  on  the	last  word  on	the %A line, which is assumed to be the author's last name.  A word in the final position, such as
       ``jr.'' or ``ed.'', will be ignored if the name beforehand ends with a comma.  Authors with two-word last names	or  unusual  constructions
       can  be	sorted	correctly by using the nroff convention ``'' in place of a blank.  A %Q field is considered to be the same as %A, except
       sorting begins with the first, not the last, word.  Sortbib sorts on the last word of the %D line, usually the year.  It also ignores lead-
       ing  articles  (like  ``A''  or ``The'') when sorting by titles in the %T or %J fields; it will ignore articles of any modern European lan-
       guage.  If a sort-significant field is absent from a record, sortbib places that record before other records containing that field.

SEE ALSO

       refer(1), addbib(1), roffbib(1), indxbib(1), lookbib(1)

AUTHORS

       Greg Shenaut, Bill Tuthill

BUGS

       Records with missing author fields should probably be sorted by title.

4.2 Berkeley Distribution					  April 29, 1985							SORTBIB(1)