Qiang Xu's questions

My script is:

#!/usr/bin/perl -w

my $line="1 2 3 4 5 6 7";
print $line;
my $thirdlast=`print $line |awk '{print $(NF-3)}'`;
print $thirdlast;

The output is:

1 2 3 4 5 6 7   awk: 0602-542 There is an extra ) character.
 The source line is 1.
 The error context is
                {print 201 1 >>>  201NF-3) <<< 
 Syntax Error The source line is 1.
 awk: 0602-502 The statement cannot be correctly parsed. The source line is 1.
        awk: 0602-542 There is an extra ) character.

What is it complaining about? Anything wrong with my script? Couldn't understand why it says The source line is 1.

What fix is needed by my script?

Just downloaded a big mkv file which is more than 20GB. It took me several days to finish the downloading. But, how to check whether the download has been completed, or it was just aborted halfway? I have this question, because for a mkv file, mplayer can still play it until the point it is broken.

Any utility in ubuntu for such kind of checks?

In the near future (probably in the year end sale season), I am going to buy a Dell laptop. Problem is, I am completely pissed off by Microsoft Windows 8, which is almost universally pre-installed in Dell computers. I've heard that there are some desktops/laptops that you can buy from Dell with Ubuntu pre-installed. But, I didn't find such desktop/laptops in Dell official site.

Where is the access point to buy the desktop/laptop from Dell with a pre-installed Ubuntu system? If Ubuntu is not available, could I buy a Dell computer pre-installed with Linux Mint?

Looks like there is a Dell Inspiron 15R (N5110) equipped with Ubuntu LTS12.04, but I didn't find it in Dell official site, and don't where to place the order.