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How to extract the first two characters of a string in shell scripting?
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Probably the most efficient method, if you're using the bash shell (and you appear to be, based on your comments), is to use the sub-string variant of parameter expansion:
pax> long="USCAGol.blah.blah.blah"
pax> short="${long:0:2}" ; echo "${short}"
US
This will set short to be the f...
WPF OpenFileDialog with the MVVM pattern? [duplicate]
...hing like the MVVM Toolkit or similar thing (so I can get a base ViewModel and a RelayCommand).
Here's an example of an extremely simple interface for doing basic IO operations like OpenFileDialog and OpenFile. I'm showing them both here so you don't think I'm suggesting you create one interface w...
Why is spawning threads in Java EE container discouraged?
...aged because all resources within the environment are meant to be managed, and potentially monitored, by the server. Also, much of the context in which a thread is being used is typically attached to the thread of execution itself. If you simply start your own thread (which I believe some servers ...
What is the fastest way to create a checksum for large files in C#
... is that SHA256Managed reads 4096 bytes at a time (inherit from FileStream and override Read(byte[], int, int) to see how much it reads from the filestream), which is too small a buffer for disk IO.
To speed things up (2 minutes for hashing 2 Gb file on my machine with SHA256, 1 minute for MD5) wra...
How do I create a namespace package in Python?
...aries as separate downloads. For example, with the directories Package-1 and Package-2 in PYTHONPATH ,
5 Answers
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Remove all the children DOM elements in div
... @Eugene: Could you say more about that?
– Tom Anderson
Aug 28 '11 at 15:39
7
@Tom: dojox.g...
Does Django scale? [closed]
...e a list of Django sites on the front page of the main Django project page and then a list of Django built sites at djangosites.org. Going through the lists and picking some that I know have decent traffic we see:
Instagram: What Powers Instagram: Hundreds of Instances, Dozens of Technologies.
Pi...
Programmer Puzzle: Encoding a chess board state throughout a game
...e: I liked this topic so much I wrote Programming Puzzles, Chess Positions and Huffman Coding. If you read through this I've determined that the only way to store a complete game state is by storing a complete list of moves. Read on for why. So I use a slightly simplified version of the problem for ...
Different ways of clearing lists
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Why the first one will only affect a? I thought a and b reference to the same object... Just wanna know why. Thanks.
– Alston
Nov 22 '14 at 9:48
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How to know if an object has an attribute in Python
...at, if the property is likely to be there most of the time, simply call it and either let the exception propagate, or trap it with a try/except block. This will likely be faster than hasattr. If the property is likely to not be there most of the time, or you're not sure, using hasattr will probably ...