小骆驼图书第十二章练习；

1.

foreach my $file (@ARGV){
	my $attribs = &attributes($file);
	print "	'$file' $attribs .\n";
}

sub attributes {
	my $file = shift @_;
	reture "does not exist " unless -e $file;	#如果不存在则直接返回
	my @attrib;
	push @attrib , "readable" if -r $file;
	push @attrib , "writeable" if -w $file;
	push @attrib, "executable" if -x $file; 
	return "exists" unless @attrib;
}