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Pass variables to Ruby script via command line
... variables and have only logical true/false values.
You can access values from environment variables:
> FIRST_NAME='Andy Warhol' ruby -e 'puts ENV["FIRST_NAME"]'
> Andy Warhol
Drawbacks are present here to, you have to set all the variables before the script invocation (only for your ruby ...
How to use WeakReference in Java and Android development?
...ence to an object, but you don't want that reference to protect the object from the garbage collector. A classic example is a cache that you want to be garbage collected when memory usage gets too high (often implemented with WeakHashMap).
Be sure to check out SoftReference and PhantomReference as...
Why would finding a type's initializer throw a NullReferenceException?
...x,qword ptr [rsi+8] ds:00000000`00000008=????????????????
Trying to load from [rsi+8] when @rsi is NULL. Lets inspect the function:
0:000> ln 000007fe`e5735403
(000007fe`e5735360) mscorlib_ni!System.RuntimeType.GetConstructorImpl(System.Reflection.BindingFlags, System.Reflection.Binder, Syst...
hadoop No FileSystem for scheme: file
...s remains (the last one that was added). In this case, the FileSystem list from hadoop-commons overwrites the list from hadoop-hdfs, so DistributedFileSystem was no longer declared.
How we fixed it
After loading the Hadoop configuration, but just before doing anything FileSystem-related, we call t...
Exposing a port on a live Docker container
...not do this via Docker, but you can access the container's un-exposed port from the host machine.
If you have a container with something running on its port 8000, you can run
wget http://container_ip:8000
To get the container's IP address, run the 2 commands:
docker ps
docker inspect container_name...
Pythonic way to check if a list is sorted or not
...% faster than using integer indexing:
# python2 only
if str is bytes:
from itertools import izip as zip
def is_sorted(l):
return all(a <= b for a, b in zip(l, l[1:]))
share
|
improve t...
How to keep Maven profiles which are activeByDefault active even if another profile gets activated?
...e by default profile because I thought there was no way to remove a module from execution. In 3.2.1 they added this as shown here. I'm leaving this comment in case someone stumbles here and is using modules for a similar reason to me.
– Captain Man
Aug 30 '16 a...
Read only the first line of a file?
...d in the docs, unless it is the only line in the file, the string returned from f.readline() will contain a trailing newline. You may wish to use f.readline().strip() instead to remove the newline.
The with statement automatically closes the file again when the block ends.
The with statement only wo...
How to remove first 10 characters from a string?
...starts at a specified character position and taking length no of character from the startIndex.
So for this scenario, you may use the first method like this below:
var str = "hello world!";
str = str.Substring(10);
Here the output is:
d!
If you may apply defensive coding by checking its leng...
CSS 100% height with padding/margin
...: calc(100% - 10px); height: calc(100% - 10px); padding: 5px; } 5 from left and 5 from right = 10, 5 from top and 5 from bottom = 10
– Chris P
Mar 15 '19 at 9:10
add ...