scalar：伪函数非真正的函数，强制引入标量上下文
#!/usr/bin/perl -w
@rocks=qw(a b c d f);
print "How many rocks do you have?\n";
print "I have ",scalar @rocks," rocks!\n";
输出结果：
How many rocks do you have?
I have 5 rocks! # 打印出rocks的种树
@lines=;
chomp(@lines);
or
chomp(@lines=); #读入所有行，去掉所有换行符（换行符除外）.
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