I'm cleaning up some bogus record creation dates in a database, and have a file that I need to read in three-line chunks. I know all the lines are the same length, so the seek works ok. My code:
#!/usr/bin/perl

use strict;
use warnings;


while(<DATA>) {
  my $len = length($_);
  chomp;
  push ( my @three, $_ );


  # Grab next two lines in file
  my $c;
  CALL:
  while (<DATA>) {
    chomp;
    last CALL if $c++ == 2;
    push ( @three, $_ );
  }


  # Do stuff to process @three
  print $_,"\t" for ( @three );
  print("\n");


  # Rewind or stop
  eof(DATA) ? last : seek(DATA, -($len*3), 1);
}

__DATA__
1
2
3
4
5
6

[download]

Output:
 1 2 3
 2 3 4
 3 4 5

Aside from adding a blank line to the end of my data (which is imho a silly workaround for a small problem), how do I get it to print the trailing triplet:
 4 5 6

Thanks -
blyman

setenv EXINIT 'set noai ts=2'

In reply to Grabbing lines three-by-three from a file by belden

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