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How to use Bash to create a folder if it doesn't already exist?

This doesn't seem to work. Can anyone help? 6 Answers 6 ...
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Find the files that have been changed in last 24 hours

...dified in the last 24 hours (last full day) in a particular specific directory and its sub-directories: find /directory_path -mtime -1 -ls Should be to your liking The - before 1 is important - it means anything changed one day or less ago. A + before 1 would instead mean anything changed at lea...
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argparse store false if unspecified

How can I store false if -auto is unspecified? I can faintly remember that this way, it stores None if unspecified 4 Answ...
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Escape double quotes in a string

... No. Either use verbatim string literals as you have, or escape the " using backslash. string test = "He said to me, \"Hello World\" . How are you?"; The string has not changed in either case - there is a single escaped " in it. This is just a way to tell C# that the characte...
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Check if PHP session has already started

...session and sometimes from a page that doesn't have session started. Therefore when I have session_start() on this script I sometimes get the error message for "session already started". For that I've put these lines: ...
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Global Git ignore

I want to set up Git to globally ignore certain files. 12 Answers 12 ...
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What's this =! operator? [duplicate]

... That's two operators, = and !, not one. It might be an obfuscated way of writing a = !b; if (a) { // whatever } setting a to the logical inverse of b, and testing whether the result is true (or, equivalently, whether b was false). Or ...
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Do HttpClient and HttpClientHandler have to be disposed between requests?

...Net.Http.HttpClient and System.Net.Http.HttpClientHandler in .NET Framework 4.5 implement IDisposable (via System.Net.Http.HttpMessageInvoker ). ...
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How to log out user from web site using BASIC authentication?

...u have to do is have the user click a logout link, and send a ‘401 Unauthorized’ in response, using the same realm and at the same URL folder level as the normal 401 you send requesting a login. They must be directed to input wrong credentials next, eg. a blank username-and-password, and in res...
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Absolute vs relative URLs

...e to know the differences between these two types of URLs: relative URLs (for pictures, CSS files, JS files, etc.) and absolute URLs. ...