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What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
...ces for Writing Dockerfiles
Because image size matters, using ADD to fetch packages from remote URLs is strongly discouraged; you should use curl or wget instead. That way you can delete the files you no longer need after they've been extracted and you won't have to add another layer in your im...
What is the _snowman param in Ruby on Rails 3 forms for?
...result, it's extremely common for Ruby applications (and PHP applications, etc. etc.) to exhibit this user-facing bug, and therefore extremely common for users to try to change the encoding as a palliative measure.
All that said, when I wrote this patch, I didn't realize that the name of the parame...
Block Declaration Syntax List
...on Syntaxes
Throughout, let
return_type be the type of object/primitive/etc. you'd like to return (commonly void)
blockName be the variable name of the block you're creating
var_type be the type object/primitive/etc. you'd like to pass as an argument (leave blank for no parameters)
varName be the...
Regular expression to match a line that doesn't contain a word
...ly filtering out what you don't want: grep -v "hede" | grep -v "hihi" | ...etc.
– Olivier Lalonde
May 5 '14 at 22:08
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What is a postback?
...age will be manipulated by the user (a button clicked or dropdown changed, etc), and this control will initiate a postback. The state of this control, plus all other controls on the page,(known as the View State) is Posted Back to the web server.
What happens?
Most commonly the postback causes the...
How do you change the server header returned by nginx?
... possibly what version.
This string is used by places like
Alexia and Netcraft to collect
statistics about how many and of what
type of web server are live on the
Internet. To support the author and
statistics for Nginx we recommend
keeping this string as is. But, for
security you ma...
Core dumped, but core file is not in the current directory?
...he core dump file in current directory itself. with name "core.giis.12344" etc. Thank you all for your answers/comments/hints .
– webminal.org
Jan 15 '10 at 6:57
21
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Duplicate and rename Xcode project & associated folders [closed]
...s, but it's not the clearest file structure for people to navigate in SCM, etc. To rename this folder without breaking all your file links, follow these steps:
In the Finder, rename the source folder. This will break your project, because Xcode won't automatically detect the changes. All of your x...
Declaring an enum within a class
...
2. Yes and no. Car::Color getColor() but void Car::setColor(Color c) because in setColor we already have the specifier.
– Matthieu M.
Mar 24 '10 at 8:16
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Python assigning multiple variables to same value? list behavior
...
If you're coming to Python from a language in the C/Java/etc. family, it may help you to stop thinking about a as a "variable", and start thinking of it as a "name".
a, b, and c aren't different variables with equal values; they're different names for the same identical value. Var...