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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