G'day agnes00,

The following reads through the input file twice: once to gather information; a second time to generate the output. The data that's collected is small; there's no reproduction of the data already in the input file. There are no nested loops. The only regex is the /;/ in the split statement.

You only showed two lines of sample data: this code will exclude the record with the two instances of 'SU LI IR ST' regardless of the order in which it appears. I've added other test data: I've no idea whether that's representative of your real data. 

#!/usr/bin/env perl

use strict;
use warnings;
use autodie ':all';
use constant {
    MATCH => 0,
    CHECK1 => 2,
    CHECK2 => 4,
    FLAG => 'SU LI IR ST',
    RECORD => 0,
    EXCLUDE => 1,
};

my $backup = 'pm_11115310_lines_BU.txt';
my $temp = 'pm_11115310_lines_TMP.txt';
my $input = 'pm_11115310_lines.txt';

`cp $backup $input`;

_print_data($input);

my (%seen, %exclude);

{
    open my $fh, '<', $input;

    while (<$fh>) {
        chomp;
        ++$exclude{$.} and next unless length;
        my @parts = split /;/, $_, 6;
        my $possible_exclude
            = $parts[CHECK1] eq FLAG && $parts[CHECK2] eq FLAG;

        if (exists $seen{$parts[MATCH]}) {
            if ($possible_exclude) {
                ++$exclude{$.};
            }
            else {
                if ($seen{$parts[MATCH]}[EXCLUDE]) {
                    ++$exclude{$seen{$parts[MATCH]}[RECORD]};
                    $seen{$parts[MATCH]}= [$., 0];
                }
            }
        }
        else {
            $seen{$parts[MATCH]} = [$., $possible_exclude];
        }
    }

    seek $fh, 0, 0;
    $. = 0;
    open my $tmp, '>', $temp;

    while (<$fh>) {
        next if $exclude{$.};
        print $tmp $_;
    }
}

`cp $temp $input`;

_print_data($input);

sub _print_data {
    my ($file) = @_;
    print '-' x 20, " $file ", '-' x 20, "\n";
    system cat => $file;
    print '-' x (42 + length $file), "\n";
}

[download]

Output:

-------------------- pm_11115310_lines.txt --------------------

S_FER_SCAM1_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0


S_FER_SCAM1_ARRESTO;ARRESTO;SU LI IR ST;0;SU LI IR ST;1;0;TS;0;0

S_FER_SCAM2_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;SU LI IR ST;0;SU LI IR ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;XU LI IR ST;0;SU LI IR ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;SU LI IR ST;0;XU LI IR ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;XU LI IR ST;0;XU LI IR ST;1;0;TS;0;0

S_FER_SCAM3_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0

S_FER_SCAM4_ARRESTO;ARRESTO;SU LI IR ST;0;SU LI IR ST;1;0;TS;0;0

S_FER_SCAM5_ARRESTO;ARRESTO;SU LI IR ST;0;SU LI IR ST;1;0;TS;0;0
S_FER_SCAM5_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0

---------------------------------------------------------------
-------------------- pm_11115310_lines.txt --------------------
S_FER_SCAM1_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;XU LI IR ST;0;SU LI IR ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;SU LI IR ST;0;XU LI IR ST;1;0;TS;0;0
S_FER_SCAM2_ARRESTO;ARRESTO;XU LI IR ST;0;XU LI IR ST;1;0;TS;0;0
S_FER_SCAM3_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0
S_FER_SCAM4_ARRESTO;ARRESTO;SU LI IR ST;0;SU LI IR ST;1;0;TS;0;0
S_FER_SCAM5_ARRESTO;ARRESTO;ST;0;ST;1;0;TS;0;0
---------------------------------------------------------------

[download]

Do note my use of a backup file. Simply overwriting your input data is not a good move at all!

— Ken

In reply to Re: How to check lines that start with the same word then delete one of them by kcott
in thread How to check lines that start with the same word then delete one of them by agnes00

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