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What's a concise way to check that environment variables are set in a Unix shell script?
...led Parameter Expansion. For example, the bash manual says:
${parameter:?word}
Display Error if Null or Unset. If parameter is null or unset, the expansion of word (or a message to that effect if word is not present) is written to the standard error and the shell, if it is not interactive, exits...
What are the primary differences between TDD and BDD? [closed]
...ails
So that I can get access to the site
Scenario: User uses wrong password
Given a username 'jdoe'
And a password 'letmein'
When the user logs in with username and password
Then the login form should be shown again
(In his article, Tom goes on to directly execute this test specific...
How to check if a value exists in an array in Ruby
...o check by a block, you could try any? or all?.
%w{ant bear cat}.any? {|word| word.length >= 3} #=> true
%w{ant bear cat}.any? {|word| word.length >= 4} #=> true
[ nil, true, 99 ].any? #=> true
See Enumerable for more information.
My inspirat...
How to paste yanked text into the Vim command line
...ern but add an alternative: / Ctrl-R, / \|alternative.
You've selected two words in the middle of a line in visual mode, yanked them with y, they are in the unnamed register. Now you want to open a new line just below where you are, with those two words: :pu. This is shorthand for :put ". The :put ...
Why is there an unexplainable gap between these inline-block div elements? [duplicate]
... markup, so what you're seeing is essentially the space character between "words" in the markup. Which is why setting a negative word-spacing can also "fix" this, although negative word-spacing and negative margin are invalid solutions because the spacing depends on your browser and your font-size (...
Block Comments in Clojure
...
A word of caution: it seems like whatever is inside a (comment ...) needs to be a proper form; e.g. (comment hello :world) is fine but (comment hello: world) yields an exception. [Edit:] It seems like I should have read the ans...
How to link to part of the same document in Markdown?
...name, anchor tag names must be lowercase, and delimited by dashes if multi-word.
[click on this link](#my-multi-word-header)
### My Multi Word Header
Update
Works out of the box with pandoc too.
share
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Using the “final” modifier whenever applicable in Java [closed]
...utable thing.
At first, it kind of looks awkward to see a lot of final keywords in your code, but pretty soon you'll stop noticing the word itself and will simply think, that-thing-will-never-change-from-this-point-on (you can take it from me ;-)
I think it's good practice. I am not using it all t...
What is stability in sorting algorithms and why is it important?
...ms with the same sorting key in order. Suppose we have a list of 5-letter words:
peach
straw
apple
spork
If we sort the list by just the first letter of each word then a stable-sort would produce:
apple
peach
straw
spork
In an unstable sort algorithm, straw or spork may be interchanged, but i...
Struct Constructor in C++?
...
@GMan: Right idea, wrong wording. A struct inherits its base classes publicly by default; there is no change to classes deriving from the struct.
– Ben Voigt
Apr 5 '13 at 17:37
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