Hello Hippo and many thanks for your help. here is what i have done : replace 

##merge data after filtering
sub singlefile {
    my ( $file,$out) = @_;
    #open file
    open(FILE, $file) or die ("error occured while opening file");
    #create list from file
    my @save = <FILE>;
    close(FILE);
    #empty table rows which do not meet criteria
    foreach (@save){
        $_ = "" unless ($_ =~ m/"ENABLED","OLTP",/ && $_ =~m/^GREP/ );
        $_ = "" if ($_ =~m/SYSMAN/|| m/SYS/);
        chomp $_;
        
    }
    #open output file, add data, close
    open(FILE, ">>OLTP.txt") or die ("error occured while opening file
+ OLTP.txt");
    foreach (@save){
        print FILE $_."\n" if ($_);
    }
    close(FILE);
}

[download]

by 

##merge data after filtering
sub singlefile {
    my ( $file,$out) = @_;
    #open file
    open(FILE, $file) or die ("error occured while opening file");
    #create list from file
    my @save = <FILE>;
    close(FILE);
    #empty table rows which do not meet criteria
    my $keep = '';
        foreach (@save){
            $_ = "" unless ($_ =~ m/"ENABLED","OLTP",/ && $_ =~m/^GREP
+/ );
            $_ = "" if ($_ =~m/SYSMAN/|| m/SYS/);
            if ($_) {
                $keep = $_;
                last;
            }
        }

        open(FILE, ">>OLTP.txt") or die ("error occured while opening 
+file OLTP.txt");
        print FILE $keep if $keep;
        close(FILE);
        }

[download]

and the result is that i got only a file with only the header "User script,Serveur Name,Instance Name,Date of script,Serveur Name2,Instance.... and nothing else. if you want to give me a mail, i can send you some data to check. thank again OliverR

In reply to Re^2: how to modify foreach by Anonymous Monk
in thread how to modify foreach by OliverR

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