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Linux bcc tools使用总结（持续更新） - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
Linux bcc tools使用总结（持续更新）Linux-bcc-toolsbcc及依赖安装（参考：INSTALL md）。1、execsnoop短时进程追踪工具，抓出短时间内谁在搞事情。使用场景：有些进程运行时间太短（可能是不断崩溃重启），因而使用其他工具无法捕获 ...
How do I create a new line in Javascript?
I am printing a pyramid of stars, I can't get the new line to print.
17 Answers
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Reading string from input with space character? [duplicate]
I'm using Ubuntu and I'm also using Geany and CodeBlock as my IDE.
What I'm trying to do is reading a string (like "Barack Obama" ) and put it in a variable:
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How do you allow spaces to be entered using scanf?
Using the following code:
11 Answers
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Principal component analysis in Python
I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, or do I have to roll my own using numpy.linalg.eigh ?
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How to get the last N records in mongodb?
I can't find anywhere it has been documented this. By default, the find() operation will get the records from beginning. How can I get the last N records in mongodb?
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How do you check whether a number is divisible by another number (Python)?
I need to test whether each number from 1 to 1000 is a multiple of 3 or a multiple of 5. The way I thought I'd do this would be to divide the number by 3, and if the result is an integer then it would be a multiple of 3. Same with 5.
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CSV in Python adding an extra carriage return, on Windows
It generates a file, test.csv , with an extra \r at each row, like so:
7 Answers
7
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How to read lines of a file in Ruby
I was trying to use the following code to read lines from a file. But when reading a file , the contents are all in one line:
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Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
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