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Using openssl to get the certificate from a server
...o get the right certificate.
openssl s_client -showcerts -servername www.example.com -connect www.example.com:443 </dev/null
Without SNI
If the remote server is not using SNI, then you can skip -servername parameter:
openssl s_client -showcerts -connect www.example.com:443 </dev/null
...
python list by value not by reference [duplicate]
Let's take an example
11 Answers
11
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quick random row selection in Postgres
...
You might want to experiment with OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hat...
Difference between map and collect in Ruby?
...ut no difference between map and collect).
Why do both map and collect exist in Ruby? The map function has many naming conventions in different languages. Wikipedia provides an overview:
The map function originated in functional programming languages but is today supported (or may be defined)...
How to save a plot as image on the disk?
... pdf() or similar
Plot your model
Close the device using dev.off()
Some example code for saving the plot to a png file:
fit <- lm(some ~ model)
png(filename="your/file/location/name.png")
plot(fit)
dev.off()
This is described in the (combined) help page for the graphical formats ?png, ?bmp,...
Create an empty object in JavaScript with {} or new Object()?
...le.
For defining empty objects they're technically the same. The {} syntax is shorter, neater (less Java-ish), and allows you to instantly populate the object inline - like so:
var myObject = {
title: 'Frog',
url: '/img/picture.jpg',
width: 300,
height: 200
...
Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
...C:\windows\system32 or c:\windows\SysWOW64 (for 32-bit process on 64-bit box).
Reading from the Path environment variable
In addition I'd check the dependencies of the DLL, the dependency walker provided with Visual Studio can help you out here, it can also be downloaded for free: http://www.depen...
MySQL Server has gone away when importing large sql file
...
As stated here:
Two most common reasons (and fixes) for the MySQL server has gone away
(error 2006) are:
Server timed out and closed the connection. How to fix:
check that wait_timeout variable in your mysqld’s my.cnf configuration file is large enough. ...
How do I check if a number evaluates to infinity?
...finity property isn't read-only which means that it can be redefined: For example, var x = 42; Infinity = 42; alert(x === Infinity); displays "true". (Admittedly that's an obscure case, and anyone who decides to redefine Infinity, NaN etc should expect odd things to happen.)
– ...
Remove duplicate elements from array in Ruby
... no, the uniq! method will return nil if the array had been unique yet Ex: a = [1,2,3,4] a.uniq -> [1,2,3,4] but a.uniq! -> nil
– duykhoa
Apr 4 '13 at 8:37
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