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记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...久生效的话，可以在~/.bash_profile、~/.bash_login、~/.profile或/etc/profile（需要管理员权限）里进行设置：
echo 'PS1="[\u@\h \W]\$ "' >> ~/.bash_profile
要修改主机名的话，可以打开“系统偏好设置”里的“共享”，然后编辑电脑名称。
快...
Is there more to an interface than having the correct methods
...happens when more than one parallel superclass implement the same method?, etc.)
Along come interfaces...
If we make Animal and Vegetable classes, with each implementing Growable, we can declare that our Cow is Animal and our Corn is Vegetable. We can also declare that both Animal and Vegetable a...
How to use unicode characters in Windows command line?
...standing is that calls that return a number-of-bytes (such as fread/fwrite/etc) actually return a number-of-characters. This causes a wide variety of symptoms, such as incomplete input-reading, hangs in fflush, the broken batch files and so on. Some background. The default code pages used for CJK "m...
Can I change the viewport meta tag in mobile safari on the fly?
... devices. For example, you can detect if the device supports touch events, etc. (i.e., with modernizr). Depends on what you're trying to do.
– markquezada
Jul 16 '15 at 0:19
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Redis key naming conventions?
...at is the best name convention if you have more keys like locale, category etc ? {resource}:{key}#{value},{key}#{value} => texts:locale#en,category#15 ? Or you have some other suggestion ?
– fsasvari
Sep 12 '17 at 9:09
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Is it worth using Python's re.compile?
...riginal definition. For example us_phone_number or social_security_number etc.
– Brian M. Sheldon
Oct 3 '18 at 13:53
2
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Principal component analysis in Python
... def pc( self ):
""" e.g. 1000 x 2 U[:, :npc] * d[:npc], to plot etc. """
n = self.npc
return self.U[:, :n] * self.d[:n]
# These 1-line methods may not be worth the bother;
# then use U d Vt directly --
def vars_pc( self, x ):
n = self.npc
retu...
Spinlock versus Semaphore
...data, and finally modifies a shared reference (append data to a container, etc.) before releasing the lock. Instead, one would acquire the lock only for the purpose of accessing the shared resource.
Since this means that there is considerably more work outside the critical section than inside it, na...
How to use Greek symbols in ggplot2?
...ression does not work, and even allows other formatting like italics, bold etc.
– Sam
Apr 1 '16 at 14:13
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Why don't self-closing script elements work?
...ting and uniting the implementations.
(This is why <br/> <hr/> etc. are valid HTML 5 despite being invalid HTML4.)
Self-closing <script> is one of the tags where implementations used to differ.
It used to work in Chrome, Safari, and Opera; to my knowledge it never worked in Intern...