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Top Forums Shell Programming and Scripting Misunderstanding of sort behavior Post 85188 by chlorine on Monday 3rd of October 2005 11:05:03 AM
Old 10-03-2005
Misunderstanding of sort behavior

Hi everyone,

I use the sort from the 5.3.0 coreutils package. I have a file consisting in 5 fields
separated by a single space, with no leading or trailing blanks.
I want to sort it first according to the 4th field, which contains integers
(some of them negative), and secondly on the second field, which is a string
(i.e. if two lines have the same value for the 4th field I want them sorted according
to the second field).

After reading the man page and the info page I came up with
sort sort -k 4,4n -k 2,2 correspondance_tmp
(where correspondance_tmp is my file), but this seems not to work because
when I ask it to check if the result is sorted according to the 4th field it says
no. So I think I must not know how to specify the fields properly.

Here is a short extract from my working session:
$ sort -k 4,4n -k 2,2 correspondance_tmp > correspondance
$ sort -c -k4,4n correspondance
sort: correspondance:37: disorder: . 0-00.com 1 -1 43
$ cat correspondance | awk '{print $4}' | sort -cn
$

This last check of sortedness exists without error, which means the
corresponding file is correctly sorted.
The line about which sorts complains in file correspondance is in
a large group of lines all having -1 for 4th field, so it seems to be
correctly placed.
All my locales are set to "C".

If anyone has any advice I'd greatly appreciate.
 

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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)
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