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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
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Behavior differences
Some differences on Bash 4.3.11:
POSIX vs Bash extension:
[ is POSIX
[[ is a Bash extension¹
regular command vs magic
[ is just a regular command with a weird name.
] is just an argument of [ that prevents further arguments from being used.
U...
Remove an item from a dictionary when its key is unknown
... answered Mar 27 '11 at 5:55
N 1.1N 1.1
11.8k66 gold badges3737 silver badges5656 bronze badges
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What kind of Garbage Collection does Go use?
...throughput, than Go 1.3 GC
Go 1.3 garbage collector updates on top of Go 1.1:
concurrent sweep (results in smaller pause times)
fully precise
Go 1.1 garbage collector:
mark-and-sweep (parallel implementation)
non-generational
non-compacting
mostly precise (except stack frames)
stop-the-world...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
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I couldn't get any of these solutions to work either. I tried Paperclip 3.1, but couldn't then my app kept telling me my image file extensions weren't approved, even though they were jpg.
I finally found success with version 3.5.1.
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UnboundLocalError on local variable when reassigned after first use
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Here are two links that may help
1: docs.python.org/3.1/faq/programming.html?highlight=nonlocal#why-am-i-getting-an-unboundlocalerror-when-the-variable-has-a-value
2: docs.python.org/3.1/faq/programming.html?highlight=nonlocal#how-do-i-write-a-function-with-output-parameters-...
proper hibernate annotation for byte[]
I have an application using hibernate 3.1 and JPA annotations. It has a few objects with byte[] attributes (1k - 200k in size). It uses the JPA @Lob annotation, and hibernate 3.1 can read these just fine on all major databases -- it seems to hide the JDBC Blob vendor peculiarities (as it should do...
Tool to read and display Java .class versions
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Version major.minor=JDK/JavaSE; 45.3=JDK1.1; 46.0=JDK1.2; 47.0=JDK1.3; 48.0=JDK1.4; 49.0=JavaSE5(1.5); 51.0=JavaSE7(1.7); 50.0=JavaSE6(1.6); 52.0=JavaSE8(1.8); 53.0=JavaSE9; 54.0=JavaSE10; 55.0=JavaSE11; 56.0=JavaSE12; 57.0=JavaSE13; 58.0=JavaSE14;
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Getting Django admin url for an object
.... The "url" template tag is documented here. In the section "New in Django 1.1:" the docs say that namespaced URLs are fine, and points you to the section on URL namespaces. Sticking it all together lets you reference the admin application easily in templates. N.B I remember the docs being differen...
Maximum length of HTTP GET request
...ewhere in the server configuration. As to the client side matter, the HTTP 1.1 specification even warns about this. Here's an extract of chapter 3.2.1:
Note: Servers ought to be cautious about depending on URI lengths above 255 bytes, because some older client or proxy implementations might not ...
What causes imported Maven project in Eclipse to use Java 1.5 instead of Java 1.6 by default and how
...;artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<executions>
<execution>
<id>default-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
...