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What's a concise way to check that environment variables are set in a Unix shell script?
... before that. It is therefore in the Korn Shell, and in the POSIX shells, including specifically Bash.
It is usually documented in the shell's man page in a section called Parameter Expansion. For example, the bash manual says:
${parameter:?word}
Display Error if Null or Unset. If parameter is ...
Replace whole line containing a string using Sed
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How to use Morgan logger?
...:
npm install --save morgan
This will add morgan to json.package file
Include the morgan in your project
var morgan = require('morgan');
3> // create a write stream (in append mode)
var accessLogStream = fs.createWriteStream(
path.join(__dirname, 'access.log'), {flags: 'a'}
);
//...
Which is the fastest algorithm to find prime numbers?
...d will always be faster than any implementation of the Sieve of Atkin SoA, including Bernstein's as linked in this answer because primesieve reduces the number of operations compared to SoA: For the 32-bit number range (2^32 - 1), primesieve does about 1.2 billion culls whereas SoA does a total of ...
Are HTTPS headers encrypted?
... added a special HTTP method, CONNECT - intended to create the SSL tunnel, including the necessary protocol handshake and cryptographic setup.
The regular requests thereafter all get sent wrapped in the SSL tunnel, headers and body inclusive.
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Override Java System.currentTimeMillis for testing time sensitive code
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UPDATE The new java.time package built into Java 8 includes a java.time.Clock class "to allow alternate clocks to be plugged in as and when required".
– Basil Bourque
Oct 26 '14 at 8:02
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Should I be using object literals or constructor functions?
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If you include the function definitions as part of the object literal, or use the this.fn = function ... approach in a constructor, each of your object instances will have their own copies of functions. Using the prototype approach,...
How can I take more control in ASP.NET?
...lution will give you programmatic access to the controls in their entirety including all attributes on the controls. Also, only the text box values will appear in the URL upon submission so your GET request URL will be more "meaningful"
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="J...
How do I set the size of Emacs' window?
...'((top . 10) (left . 30)))
The first setting applies to all emacs frames including the first one that pops up when you start. The second setting adds additional attributes to the first frame. This is because it is sometimes nice to know the original frame that you start emacs in.
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