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Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
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The C# Language Specification, paragraph 7.10.6, says: The predefined reference type equality operators are: bool operator ==(object x, object y); bool operator !=(object x, object y); The operators return the result of comparing the two references...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...序都不会受其影响：
Shell 进程 1
ulimit – s 100
cat testFile > newFile
File size limit exceeded
Shell 进程 2
cat testFile > newFile
ls – s newFile
323669 newFile
那么，是否有针对某个具体用户的资源加以限制的方法呢？答...
Convert String to Uri
...o its standards. For example, try to parse: http://www.google.com/search?q=cat|dog. An exception will be thrown for the vertical bar.
urllib makes it easy to convert a string to a java.net.URI. It will pre-process and escape the URL.
assertEquals("http://www.google.com/search?q=cat%7Cdog",
Ur...
Tool for adding license headers to source files? [closed]
...c # or whatever other pattern...
do
if ! grep -q Copyright $i
then
cat copyright.txt $i >$i.new && mv $i.new $i
fi
done
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fo...
Disable password authentication for SSH [closed]
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# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication no
Uncomment the second line, and, if needed, change yes to no.
Then run
service ssh restart
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Creating a singleton in Python
...hing that works in both Python2 and 3 requires using a slightly more complicated scheme. Since metaclasses are usually subclasses of type type, it's possible to use one to dynamically create an intermediary base class at run time with it as its metaclass and then use that as the baseclass of the pub...
How to send file contents as body entity using cURL
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If you want to be real fancy you can do: cat file.txt | curl --data "@-" `(< url.txt )` @- tells curl to read from stdin. You could also just use the redirect (< x.txt ) to put in whatever you want. If you're using bash.
– Breedly
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Get key by value in dictionary
... answered Nov 5 '11 at 21:13
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Replace words in a string - Ruby
...r gsub as a plain text substitution can lead to disastrous results:
'mislocated cat, vindicating'.gsub('cat', 'dog')
=> "mislodoged dog, vindidoging"
Regular expressions have word boundaries, such as \b which matches start or end of a word. Thus,
'mislocated cat, vindicating'.gsub(/\bcat\b/, ...
Allow user to set up an SSH tunnel, but nothing else
...say, 5000), but I want to restrict this user as much as possible. (Authentication will be with public/private keypair).
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