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How to define hash tables in Bash?
What is the equivalent of Python dictionaries but in Bash (should work across OS X and Linux).
15 Answers
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Run cron job only if it isn't already running
...-one
then add run-one before your crontab script
*/20 * * * * * run-one python /script/to/run/awesome.py
Check out this askubuntu SE answer. You can find link to a detailed information there as well.
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How many socket connections can a web server handle?
...ven C# ranks at 11 (6.9M per second). Scala and Clojure rank further down. Python ranks at 29th at 2.7M per second.
At the bottom of the list, I note laravel and cakephp, rails, aspnet-mono-ngx, symfony, zend. All below 10k per second. Note, most of these frameworks are build for dynamic pages and q...
ComponentGroup 组件组扩展：监控内容变化和批量启用禁用组件 · App Inventor 2 中文网
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主要功能
支持的组件
下载
版本历史
截图
示例应用
禁用输入区域
参考
属性 Properties
方法 Methods
事件 Events
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What Process is using all of my disk IO
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You're looking for iotop (assuming you've got kernel >2.6.20 and Python 2.5). Failing that, you're looking into hooking into the filesystem. I recommend the former.
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Subprocess changing directory
...g cd .. in a child shell process using subprocess won't change your parent Python script's working directory i.e., the code example in @glglgl's answer is wrong. cd is a shell builtin (not a separate executable), it can change the directory only in the same process.
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Why is this program erroneously rejected by three C++ compilers?
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You could try the following python script. Note that you need to install PIL and pytesser.
from pytesser import *
image = Image.open('helloworld.png') # Open image object using PIL
print image_to_string(image) # Run tesseract.exe on image
To use...
Script to get the HTTP status code of a list of urls?
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I found a tool "webchk” written in Python. Returns a status code for a list of urls.
https://pypi.org/project/webchk/
Output looks like this:
▶ webchk -i ./dxieu.txt | grep '200'
http://salesforce-case-status.dxi.eu/login ... 200 OK (0.108)
https://support...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...panion。 连接到服务器后，查看“帮助”->“伴侣信息”以下载该伴侣。 当你切换回普通的AI2服务器时，你需要重新安装普通的伴侣。
你可以使用扩展测试服务器按照下面第 2 部分中的描述实施 ScaleDetector.aix 扩展。
请记住，...
Base64Util 拓展：支持图像框、画布、文件、文本字符串、图像精灵base64编...
...码
Base64Util 扩展
下载链接
致谢
注意事项
图像框有关
画布有关
文件有关
文本字符串有关
图像精灵有关
其他可视组件有关
函数
使用示例 ...