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How to check if a given directory exists in Ruby
... write a script which automatically checks out or updates a Subversion URL based on whether a specified directory exists or not.
...
How do you change the server header returned by nginx?
...olution doesn't require any special software extension, and works with the base nginx.
– Kris
Dec 5 '17 at 23:54
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sqlalchemy unique across multiple columns
...ble.c.location_code, unique=True)
# version2: declarative
class Location(Base):
__tablename__ = 'locations'
id = Column(Integer, primary_key = True)
customer_id = Column(Integer, ForeignKey('customers.customer_id'), nullable=False)
location_code = Column(Unicode(10), nullable=False...
EC2 Can't resize volume after increasing size
...
Stop the instance
Create a snapshot from the volume
Create a new volume based on the snapshot increasing the size
Check and remember the current's volume mount point (i.e. /dev/sda1)
Detach current volume
Attach the recently created volume to the instance, setting the exact mount point
Restart th...
Visual Studio debugging “quick watch” tool and lambda expressions
...running an anonymous function changes the underlying structure of the code base. Changing the code, in general, and in particular from the immediate window, is a very difficult task.
Consider the following code.
void Example() {
var v1 = 42;
var v2 = 56;
Func<int> func1 = () => ...
Removing rounded corners from a element in Chrome/Webkit
...ckground image with position 100% 50% and no-repeat attribute. I also used base64 encoded image in css to avoid additional http requests.
– Karl Adler
Jul 23 '14 at 12:27
26
...
Fixed position but relative to container
...2em;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
Demos:
jsFiddle: Centered horizontally only
jsFiddle: Centered both horizontally and vertically
Original credit goes to user aaronk6 for pointing it out to me in this answer
...
Get name of current class?
...ted this:
class InputAssigningMetaclass(type):
def __new__(cls, name, bases, attrs):
cls.input = get_input(name)
return super(MyType, cls).__new__(cls, name, bases, newattrs)
class MyBaseFoo(object):
__metaclass__ = InputAssigningMetaclass
class foo(MyBaseFoo):
# etc, ...
JSON left out Infinity and NaN; JSON status in ECMAScript?
...SON as defined in ECMA262 5.1 does not even define whether its numbers are based on IEEE754. Since the design flow described for the stringify() function in ECMA262 does mention the three special IEEE values, one can suspect that the intention was in fact to support IEEE754 floating point numbers.
...
tcp加速技术解决方案 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...多通道和内存条rank级并行优化。一个内存通道一般使用64位数据总线，双通道同时工作提供了128位传输能力。Rank是指DIMM上几个内存颗粒共同提供的64位数据，同一条内存上的不同rank因为共享数据总线而不能被同时访问，但内存...