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Trying to SSH into an Amazon Ec2 instance - permission error

...our key file must not be publicly viewable for SSH to work. Use this command if needed: chmod 400 mykey.pem 400 protects it by making it read only and only for the owner. share | improve this a...
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ansible: lineinfile for several lines?

...ame: Set first line at EOF (1/3) lineinfile: dest=/path/to/file regexp="^string 1" line="string 1" - name: Set second line after first (2/3) lineinfile: dest=/path/to/file regexp="^string 2" line="string 2" insertafter="^string 1" - name: Set third line after second (3/3) lineinfile: dest=/pat...
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What are the differences between WCF and ASMX web services?

...and understand for the most common web service needs). WCF adds a lot of extra complexity. While MS wants to replace ASMX with WCF, there seems to be a bit of resistance to it until MS makes the most common scenarios as simple as the old [Webmethod] way. – mattmc3 ...
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Command line for looking at specific port

...In bash: netstat -na | grep "8080" In PowerShell: netstat -na | Select-String "8080" share | improve this answer | follow | ...
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Using node.js as a simple web server

...pm install http-server -g Now you can run a server via the following commands: $ cd MyApp $ http-server If you're using NPM 5.2.0 or newer, you can use http-server without installing it with npx. This isn't recommended for use in production but is a great way to quickly get a server running ...
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Select multiple images from android gallery

... Define these variables in the class: int PICK_IMAGE_MULTIPLE = 1; String imageEncoded; List<String> imagesEncodedList; Let's Assume that onClick on a button it should open gallery to select images Intent intent = new Intent(); intent.setType("image/*"); intent.putExtra(Inte...
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Access denied for user 'test'@'localhost' (using password: YES) except root user

...ysql non root/admin user, I am following the below steps for creating user and its privileges, correct me if i am doing wrong, ...
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浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...超过它,就需要使用tcp_window_scaling机制。参考:TCP Windows and Window Scaling。 Linux中通过配置内核参数里接收缓冲的大小,进而可以控制接收窗口的大小: shell> sysctl -a | grep mem net.ipv4.tcp_rmem = <MIN> <DEFAULT> <MAX> 如果我们出于传输...
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Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

...so force using a socket with the socket parameter (-S with /usr/bin/mysql) and force TCP/IP by providing a port (-P with /usr/bin/mysql.) – Kaoru Jun 1 '14 at 11:17 ...
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Get first n characters of a string

How can I get the first n characters of a string in PHP? What's the fastest way to trim a string to a specific number of characters, and append '...' if needed? ...