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How to verify if a file exists in a batch file?
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You can use IF EXIST to check for a file:
IF EXIST "filename" (
REM Do one thing
) ELSE (
REM Do another thing
)
If you do not need an "else", you can do something like this:
set __myVariable=
IF EXIST "C:\folder with...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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print("Hello World")
你可以像python一样，在命令行上运行lua命令后进入lua的shell中执行语句。
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chenhao-air:lua chenhao$ lua
Lua 5.2.2 Copyright (C) 1994-2013 Lua.org, PUC-Rio
> print("Hel...
Creating C macro with ## and __LINE__ (token concatenation with positioning macro)
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The problem is that when you have a macro replacement, the preprocessor will only expand the macros recursively if neither the stringizing operator # nor the token-pasting operator ## are applied to it. So, you have to use some extra layers of indir...
Can't resize UIView in IB
Probably something simple, but I can't figure why I cannot resize a UIView in a xib in Interface Builder.
9 Answers
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In tmux can I resize a pane to an absolute value
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usage: resize-pane [-DLRUZ] [-x width] [-y height] [-t target-pane]
[adjustment]
ie.
resize-pane -t 1 -y 5
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Difference between JOIN and INNER JOIN
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They are functionally equivalent, but INNER JOIN can be a bit clearer to read, especially if the query has other join types (i.e. LEFT or RIGHT or CROSS) included in it.
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How to extract public key using OpenSSL?
...ollowing command generates a file which contains both public and private key:
5 Answers
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Why does (“foo” === new String(“foo”)) evaluate to false in JavaScript?
... String("foo") is boxed string object.
The === operator behaves differently on primitives and objects.
When comparing primitives (of the same type), === will return true if they both have the same value.
When comparing objects, === will return true only if they refer to the same object (comparing ...
Specify custom Date format for colClasses argument in read.table/read.csv
Is there a way to specify the Date format when using the colClasses argument in read.table/read.csv?
4 Answers
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Get URL query string parameters
What is the "less code needed" way to get parameters from a URL query string which is formatted like the following?
11 Answ...