Question

我有一堆文件以JSON开头之前的随机文本开头，如下所示：

//full screen:
var narrow = new ScrollMagic.Scene({
  triggerElement: '#projects',
  offset: -10,
  triggerHook: 0,
  pushFollowers: false
})

//half size screen:
var wide = new ScrollMagic.Scene({
  triggerElement: '#secondary_nav',
  offset: 0,
  triggerHook: 0,
  pushFollowers: false
})

//enquire.js:  
enquire.register("screen and (max-width:980px)", {

  setup: function() {
    narrow.setPin('#secondary_nav ul').addIndicators().addTo(controller)
  },

  match: function() {
    narrow.remove().removePin();
    wide.setPin('#secondary_nav').addIndicators().addTo(controller);


  },

  unmatch: function() {
    wide.remove().removePin();
    var narrowpin = narrow.setPin('#secondary_nav ul').addIndicators().addTo(controller);

  },

})

我只想删除开始使用JSON的<nav id="secondary_nav" class=''> <ul> <li class="btn"><a id='toabout' href="#about">About</a> </li> <li class="btn"><a id='toprojects' href="#projects">Projects</a> </li> <li class="btn"><a id='tocontact' class='tocontact' href="#contact_a">Contact</a> </li> </ul> </nav>之前的所有内容。这就是我的尝试：

> MongoDB shell version: 3.0.6 connecting to: reddit
> 2016-03-09T13:25:25.825+0000 E QUERY    Error: don't know how to
> massage : number
>     at Error (<anonymous>)
>     at DBCollection._massageObject (src/mongo/shell/collection.js:132:11)
>     at DBCollection.find (src/mongo/shell/collection.js:172:47)
>     at (shell eval):1:35 at src/mongo/shell/collection.js:132 MongoDB shell version: 3.0.6 connecting to: reddit {
>         "_id" : "566f8b91cef21a260a66030e",
>         "time_recorded" : 1450150801,

这不会引发错误，但也没有效果。如何删除上面的所有文本（在不同文件中会有不同的随机消息）并保留{？

Answer 1

试试这个：

sed ':a /{/!{N;ba};s/.*{/{/' file

循环连接所有行，直到找到{。之后，您可以应用s命令：s/.*{/{/

Sed替换所有字符但不包括{

1 个答案: