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绘画动画组件 · App Inventor 2 中文网
...ha00表示完全透明，FF表示不透明。仅当没有背景图像时才显示背景颜色，即背景图像显示优先于。
背景图像
指定画布背景图像的文件名称。
背景Base64图像
设置Base64格式的背景图片。这需要 API 级别 >= 8。对于 API 级别低...
How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'
...g with SERVER/INSTANCENAME when everything is configured correctly, named pipes, user access rights... and suddenly it struck me, it's not a slash, it's a backslash (\).
The horror, the shame...
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MySQL CONCAT returns NULL if any field contain NULL
...ONCAT(COALESCE(`affiliate_name`,''),'-',COALESCE(`model`,''),'-',COALESCE(`ip`,''),'-',COALESCE(`os_type`,''),'-',COALESCE(`os_version`,'')) AS device_name
FROM devices
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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...out which username you should use is often lacking from the AMI Image description. But you can find some in AWS EC2 documentation, bullet point 4. :
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
Use the ssh command to connect to the instance. You'll specify the...
How to detect the physical connected state of a network cable/connector?
...nected state of an RJ45 connector to its socket. Preferably using BASH scripting only.
14 Answers
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how to detect search engine bots with php?
...s user agent with fake name and name it like "Googlebot"? I think checking ip range is more trustworthy!
– Mojtaba Rezaeian
Jul 1 '15 at 6:39
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Difference between TCP and UDP?
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TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays a...
How to create a self-signed certificate with OpenSSL
...lopment.
# DNS.5 = localhost
# DNS.6 = localhost.localdomain
# IP.1 = 127.0.0.1
# IP.2 = ::1
It's important to put DNS name in the SAN and not the CN, because both the IETF and the CA/Browser Forums specify the practice. They also specify that DNS names in the CN are depr...
Forward host port to docker container
...ter to all the containers. Assuming you are on recent ubuntu, you can run
ip addr
This will give you a list of network adapters, one of which will look something like
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 22:23:6b:28:6b:e0 brd ff:ff:ff:ff:...
开源跳板机(堡垒机)Jumpserver v2.0.0 使用说明 - 开源 & Github - 清泛网 ...
...e 可以进入二级菜单批量在主机执行命令，根据提示输入IP，支持通配符，可以逗号分隔，下面输入执行的命令
注意：报错可能提示没有目录权限，添加该目录并修改权限
# mkdir –p /opt/jumpserver/logs/exec_cmds
# chmod 777 /opt/jumpse...