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Expansion of variables inside single quotes in a command in Bash
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Inside single quotes everything is preserved literally, without exception.
That means you have to close the quotes, insert something, and then re-enter again.
'before'"$variable"'after'
'before'"'"'after'
'before'\''after'
Word concatenation is simply done by juxtapositi...
ImportError: No module named site on Windows
I am trying to install Python for the first time. I downloaded the following installer from the Python website:
Python 2.7.1 Windows Installer (Windows binary -- does not include source) . I then ran the installer, selected 'All Users' and all was fine. I installed Python into the default location:...
了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...即使其他程序在访问同一文件也如此！
unsigned long remove_all(const path& p)：此 API 尝试删除路径 p 所引用的文件或目录。与 remove 不同，此函数并不会特殊考虑不为空的目录。此函数是 UNIX rm –rf 命令的 Boost 对等项。
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SQL server query to get the list of columns in a table along with Data types, NOT NULL, and PRIMARY
...BLE
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME='TableName'
to get all the metadata you require except for the Pk information.
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What is the difference between static_cast and C style casting?
...runtime.
Also, c++ style casts can be searched for easily, whereas it's really hard to search for c style casts.
Another big benefit is that the 4 different C++ style casts express the intent of the programmer more clearly.
When writing C++ I'd pretty much always use the C++ ones over the the C...
How to set commands output as a variable in a batch file
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Only drawback to bottom approach (which is preferable in all other ways) is that it doesn't work with multi-line output.
– dgo
Nov 29 '16 at 15:46
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Git clone particular version of remote repository
...ent remote files, but the whole history. You local repository will include all this.
There might have been tags to mark a particular version at the time. If not, you can create them yourself locally. A good way to do this is to use git log or perhaps more visually with tools like gitk (perhaps gitk...
What is null in Java?
... false.
It is also the default value (for variables that have them) for all reference types:
JLS 4.12.5 Initial Values of Variables
Each class variable, instance variable, or array component is initialized with a default value when it is created:
For all reference types, the defa...
How to replace a string in multiple files in linux command line
...is appended to the old file names. So sed -i .bak 's/foo/bar/g' *.xx moves all .xx files to the equivalent .xx.bak name and then generates the .xx files with the foo→bar substitution.
– Anaphory
Oct 4 '14 at 22:35
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How to center align the ActionBar title in Android?
...'s solution did not work for me, as the content wasn't centered anymore at all. I could solve this by adding android:layout_gravity="center" to the LinearLayout.
– Silox
Jan 15 '13 at 20:40
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