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Max length for client ip address [duplicate]
...as 8 groups of 4 hex digits separated by colons: 2001:0db8:85a3:0000:0000:8a2e:0370:7334. 39 characters is appropriate to store IPv6 addresses in this format.
Edit: However, there is a caveat, see @Deepak's answer for details about IPv4-mapped IPv6 addresses. (The correct maximum IPv6 string lengt...
.htaccess not working apache
...
Enable Apache mod_rewrite module
a2enmod rewrite
add the following code to /etc/apache2/sites-available/default
AllowOverride All
Restart apache
/etc/init.d/apache2 restart
share
...
Image Greyscale with CSS & re-color on mouse-over?
...://4.bp.blogspot.com/-IzPWLqY4gJ0/T01CPzNb1KI/AAAAAAAACgA/_8uyj68QhFE/s400/a2cf7051-5952-4b39-aca3-4481976cb242.jpg);
}
svg image {
transition: all .6s ease;
}
svg image:hover {
opacity: 0;
}
<p>Firefox, Chrome, Safari, IE6-9</p>
<img class="grayscale" src="http://4.b...
Better way to shuffle two numpy arrays in unison
...17., 4., 5.]])
Now we create views simulating the original a and b:
a2 = c[:, :a.size//len(a)].reshape(a.shape)
b2 = c[:, a.size//len(a):].reshape(b.shape)
The data of a2 and b2 is shared with c. To shuffle both arrays simultaneously, use numpy.random.shuffle(c).
In production code, you w...
How to automatically start a service when running a docker container?
... /var/www"
cd /var/www
echo "Creating soft link"
ln -s /opt/mysite mysite
a2enmod headers
service apache2 restart
a2ensite mysite.conf
a2dissite 000-default.conf
service apache2 reload
if [ -z "$1" ]
then
exec "/usr/sbin/apache2 -D -foreground"
else
exec "$1"
fi
...
Find a Pull Request on Github where a commit was originally created
...commit page, with the PR link if it exists.
For example, if the SHA is 52797a7a3b087231e4e391e11ea861569205aaf4 and the repo is https://github.com/glimmerjs/glimmer-vm , then go to https://github.com/glimmerjs/glimmer-vm/commit/52797a7a3b087231e4e391e11ea861569205aaf4
...
+ operator for array in PHP?
...d be preserved or if you don't want to loose anything
$a = array(2 => "a2", 4 => "a4", 5 => "a5");
$b = array(1 => "b1", 3 => "b3", 4 => "b4");
union
print_r($a+$b);
Array
(
[2] => a2
[4] => a4
[5] => a5
[1] => b1
[3] => b3
)
merge
print_r(...
Arduino 101 实验06 - 土壤湿度传感器，做一个浇水提醒 · App Inventor 2 中文网
... 1
Grove 土壤湿度传感器
1
插 A2
一杯水 + 一盆干土
—
标定用
二、接线
传感器插在 Grove 扩展板的 A2 接口，代码里 Pin 填 2。
固件：.ino 里把 MOISTURE 设为 ...
How to list variables declared in script in bash?
...allows variable reports through (e.g. VAR=VALUE lines).
In particular, the A2 does not spuriously make it into the output.
+ function a() { echo $'\nA2=B'; }; A0=000; A9=999;
+ SOLUTION | grep '^A[0-9]='
A0=000
A9=999
AND: The "DejayClayton" problem is solved (embedded newlines in variable value...
How to compare versions in Ruby?
...
I would do
a1 = v1.split('.').map{|s|s.to_i}
a2 = v2.split('.').map{|s|s.to_i}
Then you can do
a1 <=> a2
(and probably all the other "usual" comparisons).
...and if you want a < or > test, you can do e.g.
(a1 <=> a2) < 0
or do some more fu...