小编Dav*_*ers的帖子

如何使用bash脚本查找字符串出现的行号？

例如,如果文件看起来像这样,

Hello I am Isaiah
This is a line of text.
This is another line of text.

我运行脚本来查找字符串"line",它将输出数字2,因为它是第一次出现.

我需要使用Parse.com提供的命令行工具从我的应用程序中获取最新的Cloud Code,我该怎么做？我正在与团队合作,无法覆盖现有的Cloud Code.

我正在使用Node.js,需要将文件保存到我的应用程序中的tmp目录.问题是Elastic Beanstalk没有将app目录设置为可由应用程序写入.因此,当我尝试创建临时目录时,我收到此错误

fs.js:653
  return binding.mkdir(pathModule._makeLong(path),
                 ^
Error: EACCES, permission denied '/var/app/tmp/'
    at Object.fs.mkdirSync (fs.js:653:18)
    at Promise.<anonymous> (/var/app/current/routes/auth.js:116:18)
    at Promise.<anonymous> (/var/app/current/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
    at Promise.emit (events.js:95:17)
    at Promise.emit (/var/app/current/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
    at Promise.fulfill (/var/app/current/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
    at /var/app/current/node_modules/mongoose/lib/query.js:1394:13
    at model.Document.init (/var/app/current/node_modules/mongoose/lib/document.js:250:11)
    at completeOne (/var/app/current/node_modules/mongoose/lib/query.js:1392:10)
    at Object.cb (/var/app/current/node_modules/mongoose/lib/query.js:1151:11)

我尝试过几个东西,例如.ebextensions/scripts/app-setup.sh中的app-setup.sh脚本,看起来像这样

#!/bin/bash

# Check if this is the very first time that this script is running
if ([ ! -f /root/.not-a-new-instance.txt ]) then
    newEC2Instance=true
fi



# Get the directory of 'this' script
dirCurScript=$(dirname "${BASH_SOURCE[0]}")

# Fix the line endings of …

我在我的网站上托管视频内容,并使用签名网址来防止热链接.问题是当用户在Facebook上共享视频时,它只会获取当前的URL.一旦URL过期,Facebook将不会ping该页面以查看Open Graph元标记的新内容.

示例页面源显示以下内容.

<meta property="og:video" content="https://hackerbracket.s3.amazonaws.com/5370343b2e2862ad432d2b18-97423eaf1ab8690e4f91fdb725dbaf7c2a09dfd6-low.mp4?AWSAccessKeyId=AKIAIU7HRCRAOSCZTI6Q&amp;Expires=1406058260&amp;Signature=N43bR0ZY5I66WUVxRa7kQRm%2Bml4%3D&amp;t=.mp4" />

但是,刷新后内容将更改为以下内容.

<meta property="og:video" content="https://hackerbracket.s3.amazonaws.com/5370343b2e2862ad432d2b18-97423eaf1ab8690e4f91fdb725dbaf7c2a09dfd6-low.mp4?AWSAccessKeyId=AKIAIU7HRCRAOSCZTI6Q&amp;Expires=1406058319&amp;Signature=9SnbPIAoKTHBsZill3i8JJyvEcs%3D&amp;t=.mp4" />

请注意,t=.mp4因为当URL没有以MP4结束时,Facebook似乎不喜欢它,这是有史以来最奇怪的事情.

有没有解决这个问题的方法？我不希望我的视频静态可用.也许在S3中允许Facebook的HTTP推荐人？