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bash assign default value
...G_VARIABLE_NAME=${LONG_VARIABLE_NAME:-hello} , but now bash also tries to execute 'hello' and that gives a command not found. Any way to avoid that? Or will I have to stick to the latter? Can someone give an example where the assign default is actually useful?
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How do I negate a test with regular expressions in a bash script?
Using GNU bash (version 4.0.35(1)-release (x86_64-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in:
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How to make a chain of function decorators?
...s the great advantage of only using the stdlib, and works for this simple example where there are no decorator arguments nor decorated function arguments, it has 3 major limitations: (1) no simple support for optional decorator arguments (2) not signature-preserving (3) no simple way to extract a na...
How to generate a random alpha-numeric string?
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how to create a file name with the current date & time in python?
...I don't know why you accepted this answer when there are two answers that explain perfectly well what was wrong with the code in the question. Nothing against the way Levon did this, it works fine, but when you say "not work, I don't know why", it seems odd because you have answers that explain why....
How to start nginx via different port(other than 80)
Hi I am a newbie on nginx, I tried to set it up on my server(running Ubuntu 4), which already has apache running.
5 Answer...
How to run JUnit tests with Gradle?
...> Default output folder: replace "bin" with "build". However... in my experience this seems to have the disconcerting habit of "slipping back" to the default "bin" every so often unexpectedly. Would be nice to know if there's a way of getting Eclipse to use "build" by default.
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How to assign Profile values?
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I chose not to do this, because I didn't want my code to depend on this extra tool to compile, which could have caused problems for someone else down the line when they tried to build my code without realizing that they needed this tool.
(2) Make your own class that derives from ProfileBase to re...
Should image size be defined in the img tag height/width attributes or in CSS? [duplicate]
...e be rendered as HTML as element attributes.
This is much like the alt text, which can also be said to be derived from the image. This also supports the idea that an arbitrary user agent (e.g. a speech browser) should have that information in order to relate it to the user. At the least, the aspec...
Understanding “randomness”
...Random() is usually uniformly distributed, Random() * Random() is not.
Example
This is a uniform random distribution sample simulated through a pseudo-random variable:
BarChart[BinCounts[RandomReal[{0, 1}, 50000], 0.01]]
While this is the distribution you get after multiplying two...