This is my perl script which I need to run on all the files with .txt extension and create an output file individually with .output extension. The following script runs only on one file called "2.txt." If you can let me know what changes I need to do so that it will run on all the files in the directory with .txt and create an output file with .output. Thank you. 
#!/usr/bin/perl
use warnings;

# open a file and assign the filehandle FILE
open(FILE, "2.txt") or die("can't open myfile.txt: $!\n");

while(<FILE>) {
    if($_ =~ /\s+(\S+)\s+(\S+)/)
{
    $hash{$1} = $2;
    push(@index,$1);
    push (@a2, $2);
     
    }
}

close(FILE);   # close the filehandle

#print @a2, "\n";

#foreach$key(@index)
#{
#print $key."====>".$hash{$key}."\n";
#}

$i=0;
open(FILEHANDLE, ">output.txt") or die "cannot open file for reading: 
+$!";

while ($i<= ($#a2 - 1))
{
    $c1=$a2[$i];
    $c2=$a2[$i+1];
    $c3=$a2[$i+2];
    $c4=$a2[$i+3];
    $c5=$a2[$i+4];
    $i5 = $index[$i+4];
    $c6=$a2[$i+5];
    $c7=$a2[$i+6];
    $c8=$a2[$i+7];
    $c9=$a2[$i+8];
    
$i++;

#print $c5, "\n";

if (($c1<$c2) && ($c2<$c3) && ($c3<$c4) && ($c4<$c5) && ($c5>$c6) && (
+$c6>$c7) && ($c7>$c8) && ($c8>$c9))
    {
        $peak=$c5;
        #print $peak, "\n";
        print FILEHANDLE "$i5    $peak\n";
    }
}

close (FILEHANDLE);

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In reply to Re^2: How to execute the perl program on different files in the same directory by cybersmithuk
in thread How to execute the perl program on different files in the same directory by cybersmithuk

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