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Read values into a shell variable from a pipe
... the environment is inherited by value, not by reference. This is why read doesn't bother with input from a pipe - it's undefined.
FYI, http://www.etalabs.net/sh_tricks.html is a nifty collection of the cruft necessary to fight the oddities and incompatibilities of bourne shells, sh.
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How do I find a “gap” in running counter with SQL?
... WHERE mi.id = mo.id + 1
)
Systems supporting sliding window functions:
SELECT -- TOP 1
-- Uncomment above for SQL Server 2012+
previd
FROM (
SELECT id,
LAG(id) OVER (ORDER BY id) previd
FROM mytable
) q
WHERE previ...
NoSQL - MongoDB vs CouchDB [closed]
...MongoDB and CouchDB. I know there are differences between the two. Which do you recommend learning as a first step into the NoSQL world?
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How do I vertically center text with CSS? [duplicate]
...lay
And here is another option, which may not work on older browsers that don't support display: table and display: table-cell (basically just Internet Explorer 7). Using CSS we simulate table behavior (since tables support vertical alignment), and the HTML is the same as the second example:
d...
C pointers : pointing to an array of fixed size
...-array parameter
void foo(char (*p)[10]);
(in C++ language this is also done with references
void foo(char (&p)[10]);
).
This will enable language-level type checking, which will make sure that the array of exactly correct size is supplied as an argument. In fact, in many cases people use...
When NOT to use yield (return) [duplicate]
... the outer iterator will then make O(h) nested calls to MoveNext. Since it does this O(n) times for a tree with n items, that makes the algorithm O(hn). And since the height of a binary tree is lg n <= h <= n, that means that the algorithm is at best O(n lg n) and at worst O(n^2) in time, and...
Get decimal portion of a number with JavaScript
....floor(n)
Although this won't work for minus numbers so we might have to do
n = Math.abs(n); // Change to positive
var decimal = n - Math.floor(n)
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How do I specify a password to 'psql' non-interactively?
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From the official documentation:
It is also convenient to have a ~/.pgpass file to avoid regularly having to type in passwords. See Section 30.13 for more information.
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This file should contain lines of the following format:
hos...
How to simulate Android killing my process
...can ensure that my application is behaving correctly. I want to be able to do this in an automated way so that I can test if the application behaves correctly whenever this happens, which means that I'll have to test this in every activity, etc.
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Best way to include CSS? Why use @import?
...file should almost never be used, as it can prevent stylesheets from being downloaded concurrently. For instance, if stylesheet A contains the text:
@import url("stylesheetB.css");
then the download of the second stylesheet may not start until the first stylesheet has been downloaded. If, on the ...