豆瓣上一大堆人都在探讨电影的深意，有些文章把深意挖掘得深得吓人，再继续发掘一下，可以写出圣经来了。我个人挺欣赏这个电影的，原因是它跟以往看到的都不一样，美国英雄打怪兽的电影看得太多了，基本上三板斧的情节演完，就可以收工了，这次不太一样，很多情节都出乎了我的意料。尤其到后来，坦克从逐渐散去的迷雾中开来的时候，的确太震撼了。我看着特别揪心，一下子特别体谅男主人公的感觉：就好像我平时排队买票，排在A队半个钟没动静，旁边的B队买票那个顺利，于是我一咬牙从A队跑到B队后面重新排，这个时候却发现B队开始像个蜗牛，而A队我排得那个位置马上就就可以买票了，那种心里哇凉哇凉的感觉应该跟剧中的David一样。不过队伍可以重新排，大不了多等一会儿，男主人公把自己儿子都杀了，怎么重新来过？

面对不可知的未来，谁都没法保证一定做出正确的决定。就好像昨天中秋节，陪老婆买婚纱，为了省钱跑到小偷人才济济的荷花池批发市场，原本想省下些钱，除了婚纱还可以买一些别的，结果钱包被小偷顺走了。我现在的心里都是哇凉哇凉的：当初为啥是用LP钱包的钱买婚纱，而不是用我的钱，还能少损失一点!!

再说点电影中其他似曾相识的场面：面对强大的未知敌人，超市中的人恐慌得一塌糊涂，以至于让观众见证了一次邪教诞生的完整历程。出现了文明社会绝对不会出现的场景：大兵被群殴，连通数刀之后被扔给了怪兽。这些情节总结一下，人性真是太脆弱了，花了几千年建立起来的文明体系，一旦遇到了危机便马上土崩瓦解，回归到禽兽不如的地步。512地震那天，我从2楼跑出来，看着一些人将别人从紧急通道口扒开，好让自己先出去。那种感受跟今天看电影一样，很真实。

这电影挺好的，所有腻烦了常规和主旋律的人都应该看看。

歌手：david craig     专辑：slicker than your average
Sometimes in life you feel the fight is over,
And it seems as though the writings on the wall,
Superstar you finally made it,
But once your picture becomes tainted,
It’s what they call,
The rise and fall (x2)
I always said that I was gonna make it,
Now it’s plain for everyone to see,
But this game I’m in don’t take no prisoners,
Just casualties,
I know that everything is gonna change,
Even the friends I knew before me go,
But this dream is the life I’ve been searching for,
Started believing that I was the greatest,
My life was never gonna be the same,
Cause with the money came a different status,
That’s when things change,
Now I’m too concerned with all the things I own,
David Craig
Blinded by all the pretty girls I see,
I’m beginning to lose my integrity
Sometimes in life you feel the fight is over,
And it seems as though the writings on the wall,
Superstar you finally made it,
But once your picture becomes tainted,
It’s what they call,
The rise and fall
I never used to be a troublemaker,
Now I don’t even wanna please the fans,
No autographs,
No interviews,
No pictures,
And less demands,
Given advice that was clearly wrong,
The type that seems to make me feel so right,
But some things you may find can take over your life,
Burnt all my bridges now I’ve run out of places,
And there’s nowhere left for me to turn,
Been caught in comprimising situations,
I should have learnt,
When I knew that it was best to go,
Is it too late to show you the shape of my heart,
Sometimes in life you feel the fight is over,
And it seems as though the writings on the wall,
Superstar you finally made it,
But once your picture becomes tainted,
It’s what they call,
The rise and fall
Now I know,
I made mistakes,
Think I don’t care,
But you don’t realise what this means to me,
So let me have,
Just one more chance,
I’m not the man I used to be,
Used to beeeeeeeeeee
Sometimes in life you feel the fight is over,
And it seems as though the writings on the wall,
Superstar you finally made it,
But once your picture becomes tainted,
It’s what they call,
The rise and fall (x4)

方法一：

$ cat target_file.txt|dd conv=ucase  #小写转大写

$ cat target_file.txt|dd conv=lcase  #大写转小写

方法二：

#tr [:lower:] [:upper:] < target_file.txt #小写转大写