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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...
How do I use grep to search the current directory for all files having the a string “hello” yet disp
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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.
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How to get an absolute file path in Python
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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...
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...
How to use QueryPerformanceCounter?
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#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...
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
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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
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