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常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...命令
mkdir(make directory)命令可用来创建子目录。以下例子是在当前目录下创建tool子目录。
[root@KEDACOM temp]# mkdir tool
[root@KEDACOM temp]# ls
tool
vi a.txt
Hello everyone!
:wq //在退出时，直接输入:wq会发现退不出去，退出方法是：编...
How can I export the schema of a database in PostgreSQL?
... dump data as INSERT commands, rather than COPY
--no-security-labels do not dump security label assignments
--no-synchronized-snapshots do not use synchronized snapshots in parallel jobs
--no-tablespaces do not dump tablespace assignments
--no-unlogged-table-d...
How can I detect the touch event of an UIImageView?
...aching some code below, in this code I initialize both a UIImageView and UILabel, the label works fine in terms of firing events. I tried keeping out irrelevant code.
UIImageView *single_view = [[UIImageView alloc]initWithFrame:CGRectMake(200, 200, 100, 100)];
single_view.image = img;
single_view.la...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...nvas1, which contains an ImageSprite (ArrowSprite) that we want to rotate. Label1 will show the Arrow’s heading in text format. Heading 0 points to right. We also add a RotationDetector (MyRotationDetector1) as a non-visible component.
The first key part of using Rotation Detector is to associa...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...nvas1, which contains an ImageSprite (ArrowSprite) that we want to rotate. Label1 will show the Arrow’s heading in text format. Heading 0 points to right. We also add a RotationDetector (MyRotationDetector1) as a non-visible component.
The first key part of using Rotation Detector is to associa...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...nvas1, which contains an ImageSprite (ArrowSprite) that we want to rotate. Label1 will show the Arrow’s heading in text format. Heading 0 points to right. We also add a RotationDetector (MyRotationDetector1) as a non-visible component.
The first key part of using Rotation Detector is to associa...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...nvas1, which contains an ImageSprite (ArrowSprite) that we want to rotate. Label1 will show the Arrow’s heading in text format. Heading 0 points to right. We also add a RotationDetector (MyRotationDetector1) as a non-visible component.
The first key part of using Rotation Detector is to associa...
Can I use a :before or :after pseudo-element on an input field?
...nput+span:after {
content: "*"
}
<div class="field_with_errors">Label:</div>
<div class="field_with_errors">
<input type="text" /><span></span>
</div>
I'm using this approach in AngularJS because it will add .ng-invalid classes automaticall...
Windows远程桌面授权错误（授权超时）等报错信息疑难解答 - 更多技术 - 清...
...因及解决方案。尽管这些错误消息出现在客户端，但通常是由于 Windows Server 2003 终端服务器许可证服务器或终端服务器产生错误而显示这些消息的。因此，当您在对终端服务器授权问题进行故障排除时，请先确定这是服务器配置...
How to get the last N rows of a pandas DataFrame?
...
This is because of using integer indices (ix selects those by label over -3 rather than position, and this is by design: see integer indexing in pandas "gotchas"*).
*In newer versions of pandas prefer loc or iloc to remove the ambiguity of ix as position or label:
df.iloc[-3:]
see t...