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How long is the SHA256 hash?
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you can use this select statement to test it: SELECT length(to_base64(unhex(sha2('say hello to my little friend',256)))) , it is always 44 whatever the length of original string is.
– DrAhmedJava
Apr 9 '...
SET NAMES utf8 in MySQL?
... client, thus is also needed when receiving this data, using for example a SELECT statement.
– Leopoldo Sanczyk
Nov 20 '15 at 20:54
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Git: Cannot see new remote branch
... and have the new remote branch appear in the dropdown of branches you can select.
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How to comment out a block of code in Python [duplicate]
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vim with nerdcommenter. Select the block you want and ,c<space>
– dev_nut
Oct 10 '14 at 22:37
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What does an Asterisk (*) do in a CSS selector?
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It is a wildcard, this means it will select all elements within that portion of the DOM.
For example, if I want apply margin to every element on my entire page you can use:
* {
margin: 10px;
}
You can also use this within sub-selections, for example the ...
Lock, mutex, semaphore… what's the difference?
... just one active thread from many others within one process. The other non selected threads (@ acquiring this object) are put to sleep.
[No interprocess capability, very primitive object].
2) Mutex Semaphore (aka Mutex)= Kernel object used for allowing the execution of just one active thread from ...
How do I daemonize an arbitrary script in unix?
...alls svscan, which does the main work of looking for services; it's called from init so init will arrange to restart it if it dies for any reason.
Per-service setup
Each service needs a service directory, which stores housekeeping information about the service. You can also make a location to ho...
Xcode 5: Code signing entitlement errors
... This worked for me too. I am using Xcode 6.3. I was unable to select apple dev account for code signing. Totally unrelated error message was displayed everytime "ios app id 'xxxxxxxxx' does not support changes to the maps feature". A simple xcode restart fixed it for me.
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Error type 3 Error: Activity class {} does not exist
... uninstall properly. To verify and fix this:
Go to Settings.
Go to Apps.
Select your app. (here, you can verify that your app is not uninstalled properly).
Open the overflow menu on the top right and select Uninstall for all users.
Done. Try to install then launch your app again.
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What is the best way to create constants in Objective-C
...ce of the true value of that symbol, so everyone's getting the same string from one place. That's what extern gets you.
– Peter Hosey
Nov 9 '15 at 14:11
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