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Rails migrations: self.up and self.down versus change
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For many operations rails can guess what is the inverse operation (without problems). For exampl...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...见bpftrace完整参考。
该教程贡献者是Brendan Gregg, Netflix (2018), 基于他的DTrace教程系列 DTrace Tutorial。
1. 列出所有探针
bpftrace -l 'tracepoint:syscalls:sys_enter_*'
"bpftrace -l" 列出所有探测点，并且可以添加搜索项。
探针是用于捕...
Why are C character literals ints instead of chars?
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answered Jan 11 '09 at 23:21
MalxMalx
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“Header Search Paths” vs. “User Header Search Paths” in Xcode?
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edited Jun 7 '16 at 5:30
Basil Bourque
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a...
Parsing huge logfiles in Node.js - read in line-by-line
I need to do some parsing of large (5-10 Gb)logfiles in Javascript/Node.js (I'm using Cube).
11 Answers
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Use of exit() function
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Try using exit(0); instead. The exit function expects an integer parameter. And don't forget to #include <stdlib.h>.
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Using parameters in batch files at Windows command line
...he notation %1 to %9. There are also two other tokens that you can use:
%0 is the executable (batch file) name as specified in the command line.
%* is all parameters specified in the command line -- this is very useful if you want to forward the parameters to another program.
There are also lots...
dpi value of default “large”, “medium” and “small” text views android
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jfmgjfmg
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add a co...
String concatenation in MySQL
...ators.
– DonBecker
Mar 21 '13 at 18:06
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Beware this is not entirely true: MySQL does support ||...
Is inject the same thing as reduce in ruby?
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edited May 9 '14 at 7:03
answered Dec 11 '12 at 3:44
Za...