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Top Forums Shell Programming and Scripting Concatenate and sort to remove duplicates Post 303027493 by RudiC on Monday 17th of December 2018 06:50:21 AM
Old 12-17-2018
Good idea, but, as you said, cat and paste aren't too flexible. How about this sed / sort approach that collects lines up to an empty one, replaces <newline> with a token (here: <CR> = \r), sorts the output, and undoes the replacement? Be aware that uniq also needs sorted input to work correctly.

Code:
sed -n '/^ *$/ !{H; $!b;}; {x; s/^\n//; s/\n/\r/g; s/$/\r/p;}; ' file3  | sort -u | sed 's/\r/\n/g'
* Mon Jun 8 2015 Brian Maly <brian.maly@mail.com> 2.0.7-1.0.3
- Fix stall on failure in kdump init script [bug: 21111440]
- kexec-tools: fix fail to find mem hole failure on i386  [bug: 21111440]

* Wed Feb 24  2016 Tariq Saeed <tariq.x.saeed@mail.com> 2.0.7-1.0.7
- add vmcore dump support for ocfs2 [bug: 22822573]

. The original order is lost, though, which might not be a problem because the multiple entries seem randomly distributed. To get to something like an order by date, you could try (given your sort version provides the -M option)

Code:
sort -uM -k5,5 -k3,4

instead.

Last edited by RudiC; 12-17-2018 at 08:02 AM..
 

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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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