Nvm I solved that problem myself, I was just being stupid :p
Now the problem is that I only want certain information from the fstab, but I print all of the info from fstab.
Any clue on how to only print the information you want?

 open FILE, "</mnt/etc/fstab";
   my @lines = <FILE>;
   print @lines;
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That's how I extract the information from it

Dorficus:

If I recall correctly, /etc/fstab uses whitespace to delimit the fields, so you should be able to do something like:

open FILE, '<', "/mnt/etc/fstab";
my @lines = <FILE>;
for (@lines) {
    my @fields = split /\s+/, $_;
    print "First column: $fields[0], Third column: $fields[2].\n";
}
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...roboticus

When your only tool is a hammer, all problems look like your thumb.

This really helped, it got rid of a lot of unnessecary information, but do you have any clue on how to do it vertical as well?