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Difference between single and double square brackets in Bash
... && b = b ]]: true, logical and
[ a = a && b = b ]: syntax error, && parsed as an AND command separator cmd1 && cmd2
[ a = a -a b = b ]: equivalent, but deprecated by POSIX³
[ a = a ] && [ b = b ]: POSIX and reliable equivalent
(
[[ (a = a || a = b) &...
Does “git fetch --tags” include “git fetch”?
...mano -- gitster -- in commit cc77b99, 22 May 2015)
pull: remove --tags error in no merge candidates case
Since 441ed41 ("git pull --tags": error out with a better message.,
2007-12-28, Git 1.5.4+), git pull --tags would print a different error message if
git-fetch did not return any mer...
Using python's eval() vs. ast.literal_eval()?
...aded operators) will fail. Eg. ast.literal_eval("1 & 1") will throw an error but eval("1 & 1") will not.
– Daniel van Flymen
May 22 '17 at 0:34
1
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Why does “pip install” inside Python raise a SyntaxError?
...age. I try to run pip install from the Python shell, but I get a SyntaxError . Why do I get this error? How do I use pip to install the package?
...
How can I avoid Java code in JSP files, using JSP 2?
...never the DB access throws an exception. In the above example, the default error 500 page will be displayed which you can anyway customize by an <error-page> in web.xml.
If you want to invoke some Java code to postprocess a request, e.g. processing a form submit, then implement a servlet and...
How do I wait for an asynchronously dispatched block to finish?
...skWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
XCTAssertNil(error, @"dataTaskWithURL error %@", error);
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSInteger statusCode = [(NSHTTPURLResponse *) response statusCode...
/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found
...
This lame error has been tormenting CENTOS/Ubuntu/Linux users for a while now. And why exactly the developers of these OSs did not bother with a fix or an update?? Thanks for the fix btw :)!
– roosevelt
...
How can I output the value of an enum class in C++11
...compiled it as g++ -std=c++0x enum.cpp but I'm getting a bunch of compiler errors -> pastebin.com/JAtLXan9. I also couldn't get the example from @james-mcnellis to compile.
– Dennis
May 17 '13 at 23:18
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“Git fatal: ref HEAD is not a symbolic ref” while using maven release plugin
I get the following error output while running the Maven release plugin prepare step i.e. mvn release:prepare --batch-mode -DreleaseVersion=1.1.2 -DdevelopmentVersion=1.2.0-SNAPSHOT -Dtag=v1.1.2 -X from an Atlassian Bamboo plan. However doing the same in the command line works fine. The full error...
What is a NullPointerException, and how do I fix it?
...is appropriate to throw the NullPointerException because it's a programmer error and the programmer will need that information for debugging purposes. Please include the name of the object variable in the exception message, like
Objects.requireNonNull(a, "a");
Alternatively, there may be cases whe...