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How would I get a cron job to run every 30 minutes?
... "run when the minute of each hour is 30" (would run at: 1:30, 2:30, 3:30, etc)
example #2
*/30 * * * * your_command
this means "run when the minute of each hour is evenly divisible by 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc)
example #3
0,30 * * * * your_command
this means "run when the...
How do you install Google frameworks (Play, Accounts, etc.) on a Genymotion virtual device? [duplica
I'm currently trying out Genymotion and boy, it's so much faster than the ADT emulator.
10 Answers
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Static Block in Java [duplicate]
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the order of execution is: static initializer, instance initializer, constructor
– Someone Somewhere
Feb 19 '14 at 0:46
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React.js: Wrapping one component into another
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Or you can use a Higher-Order Component :) stackoverflow.com/a/31564812/82609
– Sebastien Lorber
Jul 22 '15 at 13:41
add a c...
Static Classes In Java
...e implicitly static in that you don't need a reference to anything else in order to construct one. Personally I find the static/non-static terminology a bit odd for nested classes anyway... I think it would be simpler to talk about what the behaviour is.
– Jon Skeet
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Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...docker服务
# 创建docker服务配置文件docker.service
sudo vim /etc/systemd/system/docker.service
# 在文件中添加一下内容：
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
W...
How to access route, post, get etc. parameters in Zend Framework 2
...me', 'default');
NOTE: You could have used the superglobals $_GET, $_POST etc., but that is discouraged.
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What is SELF JOIN and when would you use it? [duplicate]
...yee as boss
from emptable e, emptable b
where e.manager_id = b.empolyee_id
order by 1
It's basically used where there is any relationship between rows stored in the same table.
employees.
multi-level marketing.
machine parts.
And so on...
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if/else in a list comprehension
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You can totally do that. It's just an ordering issue:
[unicode(x.strip()) if x is not None else '' for x in row]
In general,
[f(x) if condition else g(x) for x in sequence]
And, for list comprehensions with if conditions only,
[f(x) for x in sequence if co...
What does “rc” mean in dot files
...nix: from runcom files on the CTSS system 1962-63, via the startup script /etc/rc]
Script file containing startup instructions for an application program (or an entire operating system), usually a text file containing commands of the sort that might have been invoked manually once the system was run...