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In Docker, what's the difference between a container and an image? [duplicate]
...ile to stick around when you exit and restart the image. You're restarting from exactly the same defined state as you started in before, not where you left off.
$ docker run -i -t ubuntu /bin/bash
root@abf181be4379:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin...
JPA: unidirectional many-to-one and cascading delete
... the parent with the child in both directions. Cascading REMOVE operations from the parent to the child will require a relation from the parent to the child (not just the opposite).
You'll therefore need to do this:
Either, change the unidirectional @ManyToOne relationship to a bi-directional @Ma...
Get to UIViewController from UIView?
Is there a built-in way to get from a UIView to its UIViewController ? I know you can get from UIViewController to its UIView via [self view] but I was wondering if there is a reverse reference?
...
How to prevent rm from reporting that a file was not found?
...r a command to make rm quiet, but the only option I found is -f , which from the description, "ignore nonexistent files, never prompt", seems to be the right choice, but the name does not seem to fit, so I am concerned it might have unintended consequences.
...
How to create module-wide variables in Python? [duplicate]
...nt the variable to be "private" to the module. If you ever do an import * from mymodule, Python will not import names with two leading underscores into your name space. But if you just do a simple import mymodule and then say dir(mymodule) you will see the "private" variables in the list, and if y...
Signed to unsigned conversion in C - is it always safe?
...he unsigned value (UINT_MAX +1). Similarly what is the easy way to convert from unsigned to signed? Do we need to subtract the given number from max value (256 in case of unsigned char)? For example: 140 when converted to signed number becomes -116. But 20 becomes 20 itself. So any easy trick here?
...
What should my Objective-C singleton look like? [closed]
...
Another option is to use the +(void)initialize method. From the documentation:
The runtime sends initialize to each class in a program exactly one time just before the class, or any class that inherits from it, is sent its first message from within the program. (Thus the meth...
How to upgrade R in ubuntu? [closed]
... one,so it is convenient to check this post. Then, follow the instructions from here
Open the sources.list file:
sudo nano /etc/apt/sources.list
Add a line with the source from where the packages will be retrieved. For example:
deb https://cloud.r-project.org/bin/linux/ubuntu/ version/
R...
Django Reverse with arguments '()' and keyword arguments '{}' not found
...for generating activation link and send it via email of course. So i think from tests.py it will be same.
The correct way to do this is following:
from django.test import Client
from django.core.urlresolvers import reverse
#app name - name of the app where the url is defined
client= Client()
resp...
How to rename with prefix/suffix?
...eal lazy on their part, but rename 's/(.*).example/$1/' *.example saved me from the tedium.
– Conrad.Dean
Jun 30 '13 at 18:25
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