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From an array of objects, extract value of a property as array
... it uses a syntax that wasn't available at the time you asked the question and isn't even supported in some browsers. I'd also note that this answer is a direct copy of comments that were made on the originally accepted answer nearly a year before this answer was posted.
– Aln...
Python: access class property from string [duplicate]
I have a class like the following:
4 Answers
4
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vim 命令与快捷键 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...:set nu 设置行号插入命令i：光标后I：行首a:光标前A:行末o:光标后插入新行O:光标上插入新行定位h:leftj:downk:upl:right$:行尾0：行首H:...:set nu 设置行号
插入命令
i：光标后
I：行首
a:光标前
A:行末
o:光标后插入新行
O:光标上插入...
Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
Linux C/C++进程单实例互斥代码分享linux-process-singleton分享一段LinuxC C++程序只能启动一份实例的实现代码，原理是通过文件锁互斥实现，最重要的是考虑了不同用户运行同一程序互斥的场景，已经过充分的测试，可直接用于实际项...
Debian/Linux下安装OpenJDK8 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
Debian/Linux下安装OpenJDK8linux_install_openjdk8因为Debian11的源里不再带OpenJDK8了，需要手工来安装。下载安装包因为手工安装，所以部分依赖包需要自己下载。wget http: snapshot debian org archive debian-security 202202 因为Debian11的源里不再带Open...
Number of processors/cores in command line
I am running the following command to get the number of processors/cores in Linux:
10 Answers
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Save PL/pgSQL output from PostgreSQL to a CSV file
...ing easy to re-use or automate, you can use Postgresql's built in COPY command. e.g.
Copy (Select * From foo) To '/tmp/test.csv' With CSV DELIMITER ',' HEADER;
This approach runs entirely on the remote server - it can't write to your local PC. It also needs to be run as a Postgres "superuser" (no...
When and why are database joins expensive?
I'm doing some research into databases and I'm looking at some limitations of relational DBs.
7 Answers
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How to pass a URI to an intent?
...re the uri as string
intent.putExtra("imageUri", imageUri.toString());
and then just convert the string back to uri like this
Uri myUri = Uri.parse(extras.getString("imageUri"));
share
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impro...
How to get the process ID to kill a nohup process?
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When using nohup and you put the task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process i...