Considering I got your input data right, give a try to this script: 
#!/usr/local/bin/perl
use strict;

use Data::Dumper; # use this module for debugging only!

my @recs = ([]);
my ($in_rec, $row_count, $max_rows) = 3x(0);
while (<DATA>) {
  chomp;
  if (/Ent/.../Tester/) {
    # Inside a record!
    # add record line...
    push @{$recs[$#recs]}, $_;
    $row_count++;
  } else {
    # add empty record (which will store lines
    # for any new record to come).
    push @recs, [];
    $max_rows = $row_count if ($row_count > $max_rows);
    $row_count = 0;
  }
}

# uncomment these lines to debug..
# print Dumper(\@recs);        
# print "max rows: $max_rows\n";

# cycle through array of records..
for (@recs) {
  # if record is not empty..
  if ($row_count = scalar @$_) {
    my $i = 0;
    # print all lines in this record
    while ($i < $row_count - 1) {
      print $$_[$i++] ."\n";
    }
    # print extra 'empty' lines to increase record
    # size to that of the maximum record in the file.
    print ",\n" while ($row_count++ < $max_rows);
    # finally, print the closing line ('Tester,')
    print $$_[$i] ."\n";
  }
}

__DATA__
Ent, 
Name, 
SC011, 
BUN, 
Tester, 
Value, 
#1008 
Ent, 
Name, 
FS0022L, 
FUN, 
TL0324, 
PLEASE, 
Tester, 
Value, 
#1002 
Ent, 
Name, 
SC004, 
TAKE, 
K530, 
RUN, 
Tester, 
Value, 
#1001

[download]
And the output: 
Ent, 
Name, 
SC011, 
BUN, 
,
,
Tester, 
Ent, 
Name, 
FS0022L, 
FUN, 
TL0324, 
PLEASE, 
Tester, 
Ent, 
Name, 
SC004, 
TAKE, 
K530, 
RUN, 
Tester,

[download]
UPDATE: Included a few comments inside the script to explain how it works. I also assume that each 'record' line is on a separate line. At least, that's how I understood the problem before the original post was reformatted properly ;).

_____________________ 
$"=q;grep;;$,=q"grep";for(`find . -name ".saves*~"`){s;$/;;;/(.*-(\d+)
+-.*)$/;$_=&#91"ps -e -o pid | "," $2 | "," -v "," "&#93;`@$_`?{print"
++ $1"}:{print"- $1"}&&`rm $1`;print"\n";}

[download]

In reply to Re: Equal line spacing in records of a file by vladb
in thread Equal line spacing in records of a file by vanuatu10

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