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Delete empty lines using sed
...ly whitespace:
sed '/^[[:space:]]*$/d'
A shorter version that uses ERE, for example with gnu sed:
sed -r '/^\s*$/d'
(Note that sed does NOT support PCRE.)
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What's the result of += in C and C++?
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It would have been useful in a setting like int f(int &y); f(x += 10); - passing a reference to the modified variable into a function.
– Phil Miller
May 18 '12 at 21:00
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How do I script a “yes” response for installing programs?
...wered Aug 31 '19 at 20:24
Rohan SethRohan Seth
1,2741010 silver badges66 bronze badges
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How to split a string with any whitespace chars as delimiters
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In most regex dialects there are a set of convenient character summaries you can use for this kind of thing - these are good ones to remember:
\w - Matches any word character.
\W - Matches any nonword character.
\s - Matches any white-space character.
\...
JSON.net: how to deserialize without using the default constructor?
...s a default constructor and also an overloaded constructor that takes in a set of parameters. These parameters match to fields on the object and are assigned on construction. At this point i need the default constructor for other purposes so i would like to keep it if i can.
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What is the most pythonic way to check if an object is a number?
...t, what's the best way to determine whether it is a number? Here is is defined as acts like a number in certain circumstances .
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iOS (iPhone, iPad, iPodTouch) view real-time console log terminal
...ocumented by Apple in Technical Q&A QA1747 Debugging Deployed iOS Apps for Xcode 6 is:
Choose Window -> Devices from the Xcode menu.
Choose the device in the left column.
Click the up-triangle at the bottom left of the right hand panel to show the device console.
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How do I use Java to read from a file that is actively being written to?
I have an application that writes information to file. This information is used post-execution to determine pass/failure/correctness of the application. I'd like to be able to read the file as it is being written so that I can do these pass/failure/correctness checks in real time.
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Defining static const integer members in class definition
My understanding is that C++ allows static const members to be defined inside a class so long as it's an integer type.
7 An...
How do I print to the debug output window in a Win32 app?
...ject into a console one you need to go to the project properties panel and set:
In "linker->System->SubSystem" the value "Console (/SUBSYSTEM:CONSOLE)"
In "C/C++->Preprocessor->Preprocessor Definitions" add the "_CONSOLE" define
This solution works only if you had the classic "int ma...