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What is the easiest way to duplicate an activerecord record?
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Does this still work in Rails 3.1.0.beta? When I do q = p.clone, and then p == q, I get true back. On the other hand, if I use q = p.dup, I get false back when comparing them.
– Juno Woods
Feb 8 '11 at 2:10
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Bash tool to get nth line from a file
...tail will be slow for a huge file. I would suggest sed like this:
sed 'NUMq;d' file
Where NUM is the number of the line you want to print; so, for example, sed '10q;d' file to print the 10th line of file.
Explanation:
NUMq will quit immediately when the line number is NUM.
d will delete the li...
Don't display pushd/popd stack across several bash scripts (quiet pushd/popd)
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@xdevs23 || exit $? is equivalent to just || exit. Same for return.
– user4642212
Aug 23 at 17:51
1
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What's the difference between EscapeUriString and EscapeDataString?
...f I'm not escaping a whole URI but only part of it -- (i.e. the data for a query string parameter)? Am I escaping data for the URI, or does EscapeDataString imply something completely different?
– BrainSlugs83
Nov 10 '13 at 3:37
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What order are the Junit @Before/@After called?
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So instead of quoting the somewhat ambiguous documentation, can you please explain it in your own words? Are @Before and @After methods run before every other class method (once per method), or just before and after the entire suite of cla...
How to grant permission to users for a directory using command line in Windows?
... error about "OI not recognized". Solution: Put the user+perms argument in quotes. For example: C:\>icacls "D:\test" /grant "John:(OI)(CI)F" /T
– JDS
Jan 8 '18 at 16:56
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How to identify whether a file is normal file or directory
...n [3]: p.is_file()
Out[3]: False
In [4]: p.is_dir()
Out[4]: True
In [5]: q = p / 'bin' / 'vim'
In [6]: q.is_file()
Out[6]: True
In [7]: q.is_dir()
Out[7]: False
Pathlib is also available on Python 2.7 via the pathlib2 module on PyPi.
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Best way to determine user's locale within browser
...e with the header value in the string, eg.:
var acceptLanguage= 'en-gb,en;q=0.7,de;q=0.3';
then you could include a <script src> pointing at that external service in the HTML, and use JavaScript to parse the language header. I don't know of any existing library code to do this, though, sinc...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...an会告诉我们对象锁在的页面号范围。 假设这个范围是[p,q]， 先查找页面p-1和q+1所在的span，如果这些临近的span也是free的，则合并到[p,q]所在的span， 然后把这个span回收到PageHeap中。
CentralCache的central free lists类似ThreadCache的FreeLis...
How to copy yanked text to VI command prompt
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<C-R>" Will paste default buffer. Alternately, you can use q: to open a buffer for the next command. try :help q:
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