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When do we need curly braces around shell variables?
... # use the variable
${var} # same as above
${var}bar # expand var, and append "bar" too
$varbar # same as ${varbar}, i.e expand a variable called varbar, if it exists.
This has confused me sometimes - in other languages we refer to the variable in the same way, regardless of whether it's on ...
求助！关于拓展模块NotificationStyle的demo运行时报错的问题 - App Invent...
...ificationStyle.html
结果无论点什么按键都会报错：
edu.mit.appinventor.aicompanion3: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if so...
Django: Why do some model fields clash with each other?
..._digits=5)
animal = models.ForeignKey(
Animal, related_name="%(app_label)s_%(class)s_related")
class Meta:
abstract = True
class Height(Value):
pass
class Weigth(Value):
pass
class Length(Value):
pass
No clash here, but related_name is defined once and Djang...
How do you do Impersonation in .NET?
...t link from the Dutch programmer's blog was excellent. Much more intuitive approach to impersonation than the other techniques presented.
– code4life
Aug 22 '16 at 23:26
add a...
How to access session variables from any class in ASP.NET?
I have created a class file in the App_Code folder in my application. I have a session variable
7 Answers
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Configure Microsoft.AspNet.Identity to allow email address as username
I'm in the process of creating a new application and started out using EF6-rc1, Microsoft.AspNet.Identity.Core 1.0.0-rc1, Microsoft.AspNet.Identity.EntityFramework 1.0.0-rc1, Microsoft.AspNet.Identity.Owin 1.0.0-rc1, etc and with the RTM releases yesterday, I updated them via NuGet this evening to R...
How to check if a file exists in Documents folder?
I have an application with In-App Purchase, that when the user buy something, download one html file into the Documents folder of my app.
...
How to hide keyboard in swift on pressing return key?
I am using UITextfied while clicking on textfied keyboard appear but when i pressed the return key, keyboard is not disappearing. I used the following code:
...
How to display count of notifications in app launcher icon [duplicate]
...hout custom launchers and touch interfaces) does not allow changing of the application icon, because it is sealed in the .apk tightly once the program is compiled. There is no way to change it to a 'drawable' programmatically using standard APIs. You may achieve your goal by using a widget instead o...
Displaying the build date
I currently have an app displaying the build number in its title window. That's well and good except it means nothing to most of the users, who want to know if they have the latest build - they tend to refer to it as "last Thursday's" rather than build 1.0.8.4321.
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