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how to find host name from IP with out login to the host
...s. When this option is used, there is no
need to provide the name, class and type arguments. dig automatically
performs a lookup for a name like 11.12.13.10.in-addr.arpa and sets
the query type and class to PTR and IN respectively.
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error_log per Virtual Host?
On one Linux Server running Apache and PHP 5, we have multiple Virtual Hosts with separate log files. We cannot seem to separate the php error_log between virtual hosts.
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Uncaught ReferenceError: jQuery is not defined [duplicate]
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What is jQuery is the first script on the page and there is an error anyway?
– Green
Jul 29 '13 at 3:33
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Counting the occurrences / frequency of array elements
In Javascript, I'm trying to take an initial array of number values and count the elements inside it. Ideally, the result would be two new arrays, the first specifying each unique element, and the second containing the number of times each element occurs. However, I'm open to suggestions on the form...
Block comments in html.erb templates in rails
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The =begin approach is annoying because:
It doesn't work for mixed HTML and Ruby (or just HTML) that's on a single line
It's annoying to type
The <% if false %> approach works, but it looks weird and doesn't give anyone else who looks at your code a hint about your intentions.
My solutio...
Painless way to install a new version of R?
Andrew Gelman recently lamented the lack of an easy upgrade process for R (probably more relevant on Windows than Linux). Does anyone have a good trick for doing the upgrade, from installing the software to copying all the settings/packages over?
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Bash/sh - difference between && and ;
I normally use ; to combine more than one command in a line, but some people prefer && . Is there any difference? For example, cd ~; cd - and cd ~ && cd - seems to make the same thing. What version is more portable, e.g. will be supported by a bash-subset like Android's shell ...
Create Directory When Writing To File In Node.js
I've been tinkering with Node.js and found a little problem. I've got a script which resides in a directory called data . I want the script to write some data to a file in a subdirectory within the data subdirectory. However I am getting the following error:
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What is the correct value for the disabled attribute?
...the valid markup.
For HTML5, <input type="text" disabled /> is valid and used by W3C on their samples.
In fact, both ways works on all major browsers.
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CORS: Cannot use wildcard in Access-Control-Allow-Origin when credentials flag is true
...these questions :
Access-Control-Allow-Origin wildcard subdomains, ports and protocols
Cross Origin Resource Sharing with Credentials
Besides * is too permissive and would defeat use of credentials. So set http://localhost:3000 or http://localhost:8000 as the allow origin header.
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