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What is /dev/null 2>&1?
...Command ls -l /dev/null will give you details of this file:
crw-rw-rw-. 1 root root 1, 3 Mar 20 18:37 /dev/null
Did you observe crw? Which means it is a pseudo-device file which is of character-special-file type that provides serial access.
/dev/null accepts and discards all input; produces n...
Populate XDocument from String
...
How about this...?
TextReader tr = new StringReader("<Root>Content</Root>");
XDocument doc = XDocument.Load(tr);
Console.WriteLine(doc);
This was taken from the MSDN docs for XDocument.Load, found here...
http://msdn.microsoft.com/en-us/library/bb299692.aspx
...
快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...言，我才实盘测试交易15个交易日，我也不知道每月收益如何。按照估算，20万的实盘账户，每月稳定有净利润5000元以上（即，年收益大约30%以上，权益回撤不超过10%），同时，产生的手续费比净利润略低些，大约是净利润的9成...
How to Programmatically Add Views to Views
... have a fragment which it view already been inflated and you know that the root view is a layout, and you want to add a view to it:
View view = getView(); // returns base view of the fragment
if (view == null)
return;
if (!(view instanceof ViewGroup))
return;
ViewGr...
How to copy in bash all directory and files recursive?
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So, to clarify, capital -R option will copy the root dir again; small -r option keeps the root paths the same.
– AnneTheAgile
Aug 7 '14 at 13:27
8
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Equivalent of strace -feopen < command > on mac os X
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dtruss requires root privileges, but you might not want to run the command you want traced as root. Consider sudo dtruss -f -t open sudo -u $USER python myfile.py
– a paid nerd
Jul 27 '14 at 17:48
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On Duplicate Key Update same as insert
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There is a MySQL specific extension to SQL that may be what you want - REPLACE INTO
However it does not work quite the same as 'ON DUPLICATE UPDATE'
It deletes the old row that clashes with the new row and then inserts the new row. ...
Regular Expressions: Is there an AND operator?
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@Liam:. MySQL uses the POSIX ERE flavor, so no. It effectively sacrifices features in favor of performance, which seems reasonable to me. There's more information here.
– Alan Moore
Oct 15 '1...
How do I execute any command editing its file (argument) “in place” using bash?
...reutils so far is sponge(1), which lets you do things like this:
% sed "s/root/toor/" /etc/passwd | grep -v joey | sponge /etc/passwd
However, sponge suffers from the same problem Steve Jessop comments on here. If any of the commands in the pipeline before sponge fail, then the original file wil...
Log4net rolling daily filename with date in the file name
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To preserve file extension:
<log4net>
<root>
<level value="DEBUG"/>
<appender-ref ref="RollingLogFileAppender"/>
</root>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<f...