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Full Discussion: How to extract duplicate records with associated header record
Top Forums UNIX for Dummies Questions & Answers How to extract duplicate records with associated header record Post 302102926 by zazzybob on Monday 15th of January 2007 06:25:37 AM
Old 01-15-2007
I'd use perl for this...
Code:
$ ./input.pl 
HA
D2
D4
HC
D1
D3
$ cat ./input.pl 
#!/usr/bin/perl
# Script to print headers and duplicate items from input.txt

use warnings;
use strict;
my @records;
undef $/;

open ( INPUT, "< input.txt" ) || die "Couldn't open input file: $!\n";
# use a look-ahead assertion here
@records = split( /^(?=(?:H))/m, <INPUT> );
foreach my $record ( @records ) {
   my @lines = split( /\n/, $record );
   my $header = $lines[0];
   my %linehash;
   my $headerdone = 0;
   foreach my $line ( @lines ) {
      $linehash{$line}++;  
   }
   foreach my $key ( sort ( keys ( %linehash ) ) ) {
      my $value = $linehash{$key};
      if ( $value > 1 ) { 
         if ( $headerdone == 0 ) {
            printf( "%s\n", $header );
            $headerdone++;
         }
         printf( "%s\n", $key );
      }
   }
}
close ( INPUT );

exit ( 0 );

Cheers
ZB
 

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LEARN ABOUT DEBIAN

cdbmake

cdbmake(1)						      General Commands Manual							cdbmake(1)

NAME

       cdbmake - create a constant database

SYNOPSIS

       cdbmake cdb cdb.tmp

DESCRIPTION

       cdbmake reads a series of encoded records from its standard input and writes a constant database to cdb.

       cdbmake	ensures  that  cdb is updated atomically, so programs reading cdb never have to wait for cdbmake to finish.  It does this by first
       writing the database to cdb.tmp and then moving cdb.tmp on top of cdb.  If cdb.tmp already exists, it is destroyed.  The  directories  con-
       taining cdb.tmp and cdb must be writable to cdbmake; they must also be on the same filesystem.

       cdbmake always makes sure that cdb.tmp is safely written to disk before it replaces cdb.  If the input is in a bad format or if cdbmake has
       any trouble writing cdb.tmp to disk, cdbmake complains and leaves cdb alone.

   RECORD FORMAT
       Records are indexed by keys.  A key is a string.  cdb is structured so that another program, starting from a key, can quickly find the rel-
       evant  record.	cdbmake allows several records with the same key, although most readers take only the first record, and cdbmake slows down
       somewhat if there are many records with the same key.

       cdbmake and cdbdump(1) preserve the order of records.

       A record is encoded for cdbmake as +klen,dlen:key->data followed by a newline.  Here klen is the number of bytes in key	and  dlen  is  the
       number of bytes in data.  The end of data is indicated by an extra newline.  For example:

	 +3,5:one->Hello
	 +3,7:two->Goodbye

       key and data may contain any characters, including colons, dashes, newlines, and nulls.

       Keys and data do not have to fit into memory.  A database cannot exceed 4 gigabytes.

       cdb is portable across machines.

SEE ALSO

       cdbdump(1), cdbget(1), cdbstats(1)

																	cdbmake(1)
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