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A cron job for rails: best practices?
...).
– aceofbassgreg
Apr 11 '13 at 18:05
@Tony, Whenever is basically a domain specific language for writing cron jobs. ...
How do I see the last 10 commits in reverse-chronological order with SVN?
...eturns only till r900. Just wanted to check if this was the standard or an error. Also svn log -l10 <URL of your repository> would return the latest(r901) also.
– Shyam K
Dec 5 '12 at 4:38
...
How to modify list entries during for loop?
...terintuitive, seemingly different from other languages and has resulted in errors in my code that I had to debug for a long period of time. Python Tutorial doesn't even mention it. Though there must be some reason to it?
– xji
Jan 29 '17 at 17:25
...
Capture HTML Canvas as gif/jpg/png/pdf?
...s-domain resources in rendering your canvas, you will encounter a security error when you try to use the toDataUrl method.
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MediaHelper 媒体助手扩展：从媒体文件提取元数据和专辑封面 · App Inventor 2 中文网
...过 URL 加载专辑图像时是同步进行的，对于大文件或慢速连接可能需要较长时间
元数据完整性：并非所有元数据在所有媒体文件中都存在，某些字段可能为空
测试媒体文件：可使用 https://ullisroboterseite.de/test.mp3 进行...
How to create a MySQL hierarchical recursive query
...s, path IDs, or self-joins.
MySQL 8+
with recursive cte (id, name, parent_id) as (
select id,
name,
parent_id
from products
where parent_id = 19
union all
select p.id,
p.name,
p.parent_id
from products p
inn...
How to remove all debug logging calls before building the release version of an Android app?
...during development and, in production, no debug statements are logged, but errors are silently reported to Crashlytics.
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How do you overcome the svn 'out of date' error?
...on to another in Subversion, but I get an Item '*' is out of date commit error.
31 Answers
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How to detect if a script is being sourced
...ed.
If return is used in the top-level scope of a non-sourced script, an error message is emitted, and the exit code is set to 1.
(return 0 2>/dev/null) executes return in a subshell and suppresses the error message; afterwards the exit code indicates whether the script was sourced (0) or not ...
Converting RGB to grayscale/intensity
...evious similar question. It is very helpful:
http://cadik.posvete.cz/color_to_gray_evaluation/
It shows 'tons' of different methods to generate grayscale images with different outcomes!
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