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How do I change read/write mode for a file using Emacs?
...ent buffer writable.
Make the buffer writable as well."
(interactive)
(unix-output "chmod" "+w" (buffer-file-name))
(toggle-read-only nil)
(message (trim-right '(?\n) (unix-output "ls" "-l" (buffer-file-name)))))
The function depends on unix-output and trim-right:
(defun unix-output (comm...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...型的 App Inventor 用户来说，它仍然不够简单。2016 年夏季编程项目的目标是研究将 Cardboard 功能集成到 App Inventor 中的方法。本文介绍了两个原型应用程序，一个显示沉浸式全景图，另一个添加了 3-D 建模。我们提供了可供下载和...
How to get file creation & modification date/times in Python?
...platform way is easy - just call os.path.getmtime(path) and you'll get the Unix timestamp of when the file at path was last modified.
Getting file creation dates, on the other hand, is fiddly and platform-dependent, differing even between the three big OSes:
On Windows, a file's ctime (documented...
Difference between two dates in MySQL
...
select
unix_timestamp('2007-12-30 00:00:00') -
unix_timestamp('2007-11-30 00:00:00');
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How do I daemonize an arbitrary script in unix?
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You can daemonize any executable in Unix by using nohup and the & operator:
nohup yourScript.sh script args&
The nohup command allows you to shut down your shell session without it killing your script, while the & places your script in the backgr...
Microbit LED 矩阵 · App Inventor 2 中文网
...阵
Microbit_LED 扩展程序让 App Inventor 用户能够以编程方式更改 BBC micro:bit 的 5x5 LED 矩阵，方法是编写自定义图案或输入文本字符串。显示屏的滚动速度也可以自定义。
更多链接：
下载 micro:bit LED 矩阵的示例项目。查...
get UTC time in PHP
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@sanmai: a Unix timestamp is by definition always UTC. en.wikipedia.org/wiki/Unix_time
– nikc.org
Jul 20 '15 at 8:20
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Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
...rdcode something like #!/usr/bin/python; that's ok, but less flexible.
In Unix, an executable file that's meant to be interpreted can indicate what interpreter to use by having a #! at the start of the first line, followed by the interpreter (and any flags it may need).
If you're talking about oth...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...一种标识方式是不用加代码的，在配置文件中通过声明型编程实现：
<system.runtime.serialization>
<dataContractSerializer>
<declaredTypes>
<add type="WcfServiceDemo.Address, MyAssembly, Version=2.0.0.0, Culture=neutral,PublicKeyToken=null, processorArchitect...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...一种标识方式是不用加代码的，在配置文件中通过声明型编程实现：
<system.runtime.serialization>
<dataContractSerializer>
<declaredTypes>
<add type="WcfServiceDemo.Address, MyAssembly, Version=2.0.0.0, Culture=neutral,PublicKeyToken=null, processorArchitect...