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Top Forums UNIX for Beginners Questions & Answers awk for matching fields between files with repeated records Post 303041181 by jvoot on Sunday 17th of November 2019 12:48:25 AM
Old 11-17-2019
awk for matching fields between files with repeated records

Hello all, I am having trouble with what should be an easy task, but seem to be missing something fundamental. I have two files, with File 1 consisting of a single field of many thousands of records. I also have File 2 with two fields and many thousands of records.

My goal is that when $1 of File 1 matches $1 of File 2, then print $1 and $2 of File 2, or alternatively, print $1 from File 1 with $2 of File 2 when $1 and $2 match between the files. The problem is that File 1 has repeated records in it. Thus when I apply awk 'FNR==NR{a[$1]; next} $1 in a' File 1 File 2 I can get all matches where $1 in File 1 matches $1 in File 2 and then output $1 && $2 in File 2, but without the repeated records. However, I need the order of the records in File 1 to be retained as well as all of the repeated records.

File 1
Code:
ABC
DEF
XYZ
ABC
DEF
ABC
XYZ

File 2
Code:
ABC 123
DEF 345
XYZ 678

Desired Output:
Code:
ABC 123
DEF 345
XYZ 678
ABC 123
DEF 345
ABC 123
XYZ 678

NB: The records are much more varied and repeats much further spread out in the actual file than the simplified examples here.

I had a somewhat similar, albeit more involved, issue in the past that RudiC helped me with (see here), but I am having trouble applying his code to this simpler example.

I got it close with this:
Code:
awk 'NR==FNR {q=$1; $1=""; T[q "," ++C[q]] = $0; next} {q=$1; X=q "," ++D[q]; printf "%s\t",  $0; if(X in T); print T[X]}' File 2 File 1

While this attempt printed all of the repeated records of File 1, it only supplied $2 from File 2 along with $1 of File 1 on the first time it appears, but not every time, such as the following:

Code:
ABC 123
DEF 345
XYZ 678
ABC
DEF
ABC
XYZ

Thanks so much in advance.

Thanks so much.

Last edited by vbe; 11-17-2019 at 10:46 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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