All you need to do is use open:

open FILEHANDLE, filename;
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Then all you have to do is read from your FILEHANDLE with <FILEHANDLE>. If you assign this to a scalar like $line=<FILE>, you'll get one line. However if you set it equal to an array like @lines=<FILE> you'll get all the lines.

Then you should use close when you're finished reading from the file:

open FILE, "myfile" or die "Couldn't open: $!";
@lines=<FILE>; #get all the lines from the file
close FILE;
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open FILE2, "myfile2" or die "Couldn't open: $!";
while(<FILE2>){  #reads in from the file a line at a time and puts it 
+in the default variable
  print $_;      #print the default variable $_ which the line is stor
+ed in.
}  
close FILE2;
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