Extract specific data from multiple text files in a directory

Question

This is my first program in perl. I have more than 1000 files and I want to extract specific data from a file. The structure of all the files are same. Its really difficult to open every file and then copy a specific data,

How can I achieve this using perl.

The structure looks like this.

    LensMode=Normal
    MicronMarker=500
    DataDisplayCombine=1
    Voltage=0 Volt
    PixelSize=1.586612

I want to extract MicronMarker and PixelSize from each file. Any help in the right direction is appreciated.

the location is D:\Files\Folder1

What do you want to do with these values once you have extracted them — Borodin
– Borodin, Commented Aug 26, 2015 at 3:49
It doesn't look like you've made an attempt to solve this problem yourself. You'll usually get better feedback if you at least make an effort, rather than just asking people to come up with the entire solution for you. — Matt Jacob
– Matt Jacob, Commented Aug 26, 2015 at 15:49

mkHun · Accepted Answer · 2015-08-26 04:06:14Z

2

Try this

Use glob to read the directory

while (my $files = glob(" D:\Files\Folder1\*"))
{
    open my $handler,"<","$files";
    my @extract = grep{ m/^(MicronMarker|PixelSize)/g} <$handler>;  
    print @extract;
}

Extract the word from a file using the while loop by opendir.

opendir(my $dir, " D:\Files\Folder1");

while (my $ech = readdir($dir))
{
    open my $handler,"<","test/$ech";
    while(my $l = <$handler>)
    {
        if($l =~m/^(?:MicronMarker|PixelSize)/g)
        {
            print "$l";

        }

    }
    close ($handler);
}

This is easy way to extract a words from a file using grep

while (my $ech = readdir($dir))
{
    open my $handler,"<","test/$ech";
    my @extract = grep{ m/^(MicronMarker|PixelSize)/g} <$handler>;
    print @extract;
    close($handler);
}

edited Aug 26, 2015 at 4:06

answered Aug 26, 2015 at 3:57

mkHun

5,9479 gold badges45 silver badges96 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Extract specific data from multiple text files in a directory

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related