perl_notes_09_28

1.
print 'test \n';
print "test \n";

$$: perl test.pl
$$: test \ntest
$$:

2.
$a = 'abc' . 'dd';   # a的内容是abcdd
print "$a"x3 . "\n";      
print '$a'x3;          

print "$a"x3 . '\n';        

结果：

abcddabcddabcdd

$a$a$aabcddabcddabcdd\n

没有新开一行