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What is the “-d” in “npm -d install”?
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It's a shortcut for --loglevel info
See the Shorthands and Other CLI Niceties section:
-d: --loglevel info
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Sending emails with Javascript
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You can use this free service: https://www.smtpjs.com
Include the script:
<script src="https://smtpjs.com/v2/smtp.js"></script>
Send an email using:
Email.send(
"from@you.com",
"to@them.com",
"This is a subject",
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How do you rename a Git tag?
...is because annotated tags are objects while lightweight tags are not, more info in this answer).
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How to implement history.back() in angular.js
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Ideally use a simple directive to keep controllers free from redundant $window
app.directive('back', ['$window', function($window) {
return {
restrict: 'A',
link: function (scope, elem, attrs) {
elem.bind('click', function () {...
Testing whether a value is odd or even
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@MartijnScheffer - Feel free to send me the bill for all that extra memory that you'll have to buy. Note that the question did include conversions from other types to number, and clearly the point of what I'm suggesting here is to have a simple one-...
ansible: lineinfile for several lines?
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Here is a noise-free version of the solution which is to use with_items:
- name: add lines
lineinfile:
dest: fruits.txt
line: '{{ item }}'
with_items:
- 'Orange'
- 'Apple'
- 'Banana'
For each item, if the item ex...
Extending the User model with custom fields in Django
...ser) property.
Extending the existing User model
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If you wish to store information related to User, you can use a one-to-one relationship to a model containing the fields for additional information. This one-to-one model is often called a profile model, as it might store non-auth related informa...
Is there any way to view the currently mapped keys in Vim?
...The above list is not complete. Typing :help map in Vim will give you more info.
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Difference between dict.clear() and assigning {} in Python
...with c_kwargs.clear()
If someone thinks up a more practical example, feel free to edit this post.
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How to calculate md5 hash of a file using javascript
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Thank for the info regarding MS Edge! I work for a company. And you know, that customers often use old software and how hard it is to convince them to update their software. I just wanted to point out, that one has to be careful using read...