October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Content preview from Perl语言入门（第8版）
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330
｜
附录
A
2.
下面是实现方法之一：
print "Which directory? (Default is your home directory) ";
chomp(my $dir = <STDIN>);
if ($dir =~ /\A\s*\z/) { #
若是空行
chdir or die "Can't chdir to your home directory: $!";
} else {
chdir $dir or die "Can't chdir to '$dir': $!";
}
my @files = <.* *>; ##
现在加上了
.*
foreach (sort @files) { ##
现在排序
print "$_\n";
}
和前一题有两点差别：第一，这次的
glob
操作包含了“点号星号”，它会匹配
所有以点号开头的文件名；第二，我们必须对所得到的列表进行排序，因为取出
的列表中，以点号开头的文件名会和不以点号开头的文件名交错排列，看起来比
较凌乱，排序之后会清楚很多。
3.
下面是实现方法之一：
print 'Which directory? (Default is your home directory) ';
chomp(my $dir = <STDIN>);
if ($dir =~ /\A\s*\z/) { #
若是空行
chdir or die "Can't chdir to your home directory: $!";
} else {
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.