小时代5-perl chdir函数应用

perl中，chdir函数用来改变当前的工作目录到指定目录，如果没有指定目录，则到用户的主目录。这个函数的调用是相当于Unix中的cd命令来切换目录。
下面通过一个具体的例子来看一下chdir是如何工作的。

    use strict;
    use warnings;
    # Print all files in a directory
    sub print_files {
        my $dir = ‘d:/code‘;
        opendir DIR, $dir or die $!;
        my @files = readdir DIR;
        chdir $dir; # Use chdir or -f will not work, since -f need absolutely path
        foreach my $file (@files) {
            if (-f $file) {
                print "$filen";
            }
        }
    closedir DIR;
    }
     
    &print_files();

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