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How to mkdir only if a directory does not already exist?
I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "Fil...
How do you pass arguments to define_method?
I would like to pass an argument(s) to a method being defined using define_method, how would I do that?
4 Answers
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What is the difference between char array and char pointer in C?
I am trying to understand pointers in C but I am currently confused with the following:
8 Answers
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How to delete duplicate lines in a file without sorting it in Unix?
Is there a way to delete duplicate lines in a file in Unix?
9 Answers
9
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Overriding id on create in ActiveRecord
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id is just attr_protected, which is why you can't use mass-assignment to set it. However, when setting it manually, it just works:
o = SomeObject.new
o.id = 8888
o.save!
o.reload.id # => 8888
I'm not sure what the original motivation ...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
I came upon the Curry-Howard Isomorphism relatively late in my programming life, and perhaps this contributes to my being utterly fascinated by it. It implies that for every programming concept there exists a precise analogue in formal logic, and vice versa. Here's a "basic" list of such analogies...
Partly cherry-picking a commit with Git
I'm working on 2 different branches: release and development .
7 Answers
7
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Set object property using reflection
Is there a way in C# where I can use reflection to set an object property?
10 Answers
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C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++中智能指针的设计和使用 智能指针(smart pointer)是存储指向动态分配（堆）对象指针的类，用于生存期控制，能够确保自动正确的销毁动态分配的对象，防止内存泄露。它的一种通用实现技术是使用引用计 智能指针(smart p...
Converting a Java Keystore into PEM Format
I am trying to convert from a Java keystore file into a PEM file using keytool and openssl applicactions. But I could not find a good way to do the conversion. Any ideas?
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