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Homework and Emergencies Homework & Coursework Questions linux sort command Post 302708791 by Don Cragun on Tuesday 2nd of October 2012 08:43:39 AM
Old 10-02-2012
Quote:
Originally Posted by bakunin
There are some "sort" intrinsics to be considered and i think you haven't covered them all yet. This might not have any impact on your test file, but may well change the sorting order in another sample.

Lets see:

The default behavior of "sort" is to sort from the field/position given in te argument to the "-k" option to the end of line. That means:

Code:
sort -k 2 /some/file

will sort on field 2 first, in case f2 is equal on field 3, if this is equal too on field 4, etc. to the end of line. As you want to search on a last name - first name basis you have to state that:

Code:
sort -k 2,2 -k 1,1

You are lucky that you use only full fields, because it is possible to base sorting order on a sub-field starting at the n-th character of a certain field. Alas, character-numbering is sometimes 1-based and sometimes zero-based, depending on "-t" or "-b" being used - as i learned myself recently the hard way.

I hope this helps.

bakunin
Very close... According to the standards (and the sort utilities I've used tend to follow the standards pretty closely), what you said about sort -k 2 is exactly correct. But, sort -k 2,2 sorts on the 2nd field and if two or more lines compare equal on that field, the entire line is used as the secondary sort key. So sort -k 2,2 performs exactly the same sort as sort -k 2,2 -k 1,1.
 

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sortbib(1)						      General Commands Manual							sortbib(1)

Name
       sortbib - sort bibliographic database

Syntax
       sortbib [-sKEYS] database...

Description
       The  command 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 may not be used in a pipeline to read standard input.

       By default, 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.

       The command 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 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.  The command sorts on the last word of the %D line, usually the year.  It also ignores leading
       articles (like ``A'' or ``The'') when sorting by titles in the %T or %J fields; it will ignore articles of any  modern  European  language.
       If a sort-significant field is absent from a record, places that record before other records containing that field.

Options
       -sKEYS
	  Specifies new sort KEYS.  For example, ATD sorts by author, title, and date.

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

																	sortbib(1)
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