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Check if database exists in PostgreSQL using shell
...to tell me about whether it is possible to use shell to check if a PostgreSQL database exists?
12 Answers
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How do I request a file but not save it with Wget? [closed]
I'm using Wget to make http requests to a fresh web server. I am doing this to warm the MySQL cache. I do not want to save the files after they are served.
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diff to output only the file names
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From the diff man page:
-q Report only whether the files differ, not the details of the differences.
-r When comparing directories, recursively compare any subdirectories found.
Example command:
diff -qr dir1 dir2
Example output (depends...
How can you determine a point is between two other points on a line segment?
... that the dot product of (b-a) and (c-a) is positive and is less than the square of the distance between a and b.
In non-optimized pseudocode:
def isBetween(a, b, c):
crossproduct = (c.y - a.y) * (b.x - a.x) - (c.x - a.x) * (b.y - a.y)
# compare versus epsilon for floating point values, o...
Retrieving parameters from a URL
Given a URL like the following, how can I parse the value of the query parameters? For example, in this case I want the value of def .
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Programmatically open Maps app in iOS 6
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Found the answer to my own question. Apple documents its maps URL format here. It looks like you can essentially replace maps.google.com with maps.apple.com.
Update: It turns out that the same is true in MobileSafari on iOS 6; tapping a link to http...
AngularJS - placeholder for empty result from filter
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A tweak on the approach that only requires you to specify the filter once:
<li ng-repeat="bar in filteredBars = (bars | filter:barFilter)">{{bar.name}}</li>
</ul>
<p ng-hide="filteredBars.length">Nothing here!</p>
Fiddle
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Parse query string in JavaScript [duplicate]
I need to parse the query string www.mysite.com/default.aspx?dest=aboutus.aspx .
How do I get the dest variable in JavaScript?
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Simple Vim commands you wish you'd known earlier [closed]
... trick that I learnt is a method of doing complicated search-and-replace. Quite often in the past, I've had a really complicated regexp to do substitutions on and it's not worked. There is a better way:
:set incsearch " I have this in .vimrc
/my complicated regexp " Highlighted as...
How to check if a string contains a substring in Bash
...i
Note that spaces in the needle string need to be placed between double quotes, and the * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.
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