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Insert a line at specific line number with sed or awk
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243
sed -i '8i8 This is Line 8' FILE
inserts at line 8
8 This is Line 8
into file FILE
-i d...
Oracle Differences between NVL and Coalesce
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COALESCE is more modern function that is a part of ANSI-92 standard.
NVL is Oracle specific, it was introduced in 80's before there were any standards.
In case of two values, they are synonyms.
However, they are implemented differently.
NVL always evaluates both arguments, whil...
How to count the number of true elements in a NumPy bool array
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265
You have multiple options. Two options are the following.
numpy.sum(boolarr)
numpy.count_nonz...
Ternary operator is twice as slow as an if-else block?
...duced by the X86 and X64 JITs for each of these cases.
X86, if/then
32: foreach (int i in array)
0000007c 33 D2 xor edx,edx
0000007e 83 7E 04 00 cmp dword ptr [esi+4],0
00000082 7E 1C jle 000000A0
00000084 8B 44 ...
How to open a second activity on click of button in android app
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12 Answers
12
Active
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Best way to synchronize local HTML5 DB (WebSQL Storage, SQLite) with a server (2 way sync) [closed]
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2 Answers
2
Active
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How do I pipe or redirect the output of curl -v?
...ways gets printed to the terminal, regardless of whether I redirect it via 2> or > or |. Is there a way to get around this? Why is this happening?
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Writing outputs to log file and console
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exec 3>&1 1>>${LOG_FILE} 2>&1
would send stdout and stderr output into the log file, but would also leave you with fd 3 connected to the console, so you can do
echo "Some console message" 1>&3
to write a message just to the console...
Difference between dispatch_async and dispatch_sync on serial queue?
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for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 but 1 always before 3
for this code
dispatch_sync(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_sync(_serialQu...
MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ane的数组
CDockablePane m_Panes[5];//一个CDockablePane的数组
2. CFrameWndEx:: OnCreate() 在Create函数中自动生成了以下代码，对MFC比较熟悉的这里就不讲了：
CMFCPopupMenu::SetForceMenuFocus(FALSE);
InitUserToolbars(NULL, uiFirstUserToolBarId, uiLastUserToolBa...