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How to use sed to remove the last n lines of a file

I want to remove some n lines from the end of a file. Can this be done using sed? 22 Answers ...
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Catching multiple exception types in one catch block

I'd like a cleaner way to obtain the following functionality, to catch AError and BError in one block: 11 Answers ...
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How to get the position of a character in Python?

...the search string isn't found. find() returns -1 and index() raises ValueError. Using find() >>> myString = 'Position of a character' >>> myString.find('s') 2 >>> myString.find('x') -1 Using index() >>> myString = 'Position of a character' >>> my...
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How do I use grep to search the current directory for all files having the a string “hello” yet disp

... grep -l hello **/*.{h,cc} You might want to shopt -s nullglob to avoid error messages if there are no .h or no .cc files. share | improve this answer |
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How to get an absolute file path in Python

... Very helpful. Using os.path.abspath() gave me an error: AttributeError: 'NoneType' object has no attribute 'startswith', using Path().resolve() does not with the same relative filepath. (Linux and Python3.4) – NuclearPeon Aug 31 '15 at...
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使用std::string作为std::map的key出错解决 - C/C++ - 清泛网 - 专注C/C++及内核技术

...gram files (x86) microsoft visual studio 11.0 vc include xstddef(180): error C2784: bool std::operator <(const st...c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: “bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)”: 未...
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How to use QueryPerformanceCounter?

... #include <windows.h> double PCFreq = 0.0; __int64 CounterStart = 0; void StartCounter() { LARGE_INTEGER li; if(!QueryPerformanceFrequency(&li)) cout << "QueryPerformanceFrequency failed!\n"; PCFreq = double(li.QuadPart)/1000.0; QueryP...
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PHP - Extracting a property from an array of objects

...ray_map with create_function in it you will always get an Out of memory... error sometime. So don't use create_function and use array_map(function($o) { return $o->id; }, $objects); – algorhythm Sep 12 '14 at 11:47 ...
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Emacs on Mac OS X Leopard key bindings

... answered Oct 2 '08 at 16:05 mike511mike511 1,44133 gold badges1515 silver badges1818 bronze badges ...
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How do I test a file upload in rails?

... I get a "uninitialized constant ActionController::TestUploadedFile" error when I run a test with this code. Anything else I would need to require in the file? – Vini.g.fer May 21 '15 at 18:21 ...