Sort a file

Do you mean sort first column in ascending order? You could call the Unix command line sort from perl:
system("sort test.txt > sorted.txt");

Alternatively:
open(IN, "<test.txt");
@lines = <IN>;
open(OUT ">sorted.txt");
print(OUT sort @lines);
close(IN);
close(OUT);

Hello,

Thank you for your quick answer.
I have still a little problem (I hope)

When I use the system sort command, the sorting will go to the second line if the first row values are the same. When the first row values are the same I want the order be original.

When I sort the coden down here,

2|ca|sdsjhdg|dkhsfjkh|3
5|va|sdsjhdg|dkhsfjkh|3
5|ba|sdsjhdg|dkhsfjkh|3
4|ga|sdsjhdg|dkhsfjkh|3
2|ba|sdsjhdg|dkhsfjkh|3

I want it to sort to:

2|ca|sdsjhdg|dkhsfjkh|3
2|ba|sdsjhdg|dkhsfjkh|3
4|ga|sdsjhdg|dkhsfjkh|3
5|va|sdsjhdg|dkhsfjkh|3
5|ba|sdsjhdg|dkhsfjkh|3

is this possible!?

@lines = <IN>;
print @lines[sort {$lines[$a] <=> $lines[$b] || $a <=> $b} 0..$#lines];

Question to OZO:

Where to place these lines.
Do I have to replace the lines in terraplanes answer!

$settings = "test.txt";
$settings_sort = "sorted.txt";

open(IN, "<$settings");
@lines = <IN>;
open(OUT ">$settings_sort");
print @lines[sort {$lines[$a] <=> $lines[$b] || $a <=> $b} 0..$#lines];
close(IN);
close(OUT);

Is it also possible to write the sorted values to the same file (in example test.txt) and not to a other file (in example sorted.txt). I want the test.txt be sorted.

When I try to use the code above (in last comment) I get an error 500??
What can be the cause of that?

Î fixed the error 500 myself. After
open(OUT there has te be a ,

But could you please try to answer my other question?

$settings = "test.txt";
$settings_sort = "sorted.txt";

open(IN, "<$settings");
@lines = <IN>;
close(IN);
open(OUT, ">$settings_sort");
print OUT @lines[sort {$lines[$a] <=> $lines[$b] || $a <=> $b} 0..$#lines];
close(OUT);

Thank you for your answer!

But what about the other question I asked.

Is it also possible to write the sorted values to the same file (in example test.txt) and not to a other file (in example sorted.txt). I want the test.txt be sorted.

I do not want to use: the file sorted.txt or is the only solution to rename the sort.txt to test.txt?