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Difference between single and double square brackets in Bash
...nt of [ that prevents further arguments from being used.
Ubuntu 16.04 actually has an executable for it at /usr/bin/[ provided by coreutils, but the bash built-in version takes precedence.
Nothing is altered in the way that Bash parses the command.
In particular, < is redirection, && a...
Disable XML validation in Eclipse
...o have changed in newer versions of Eclipse - at least my Eclipse Mars installation doesn't have an "XML Schema Validator" entry. Instead, the context menu of the project lists every validation under "validation", as described in the answer of kevinarpe.
– Stephan Rauh
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How can I do DNS lookups in Python, including referring to /etc/hosts?
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I'm not really sure if you want to do DNS lookups yourself or if you just want a host's ip. In case you want the latter,
import socket
print(socket.gethostbyname('localhost')) # result from hosts file
print(socket.gethostbyname('googl...
Why use a prime number in hashCode?
...ly be determined by the least significant entry (the one not multiplied at all). Similar entries will collide. Not good for a hash function.
31 is a large enough prime that the number of buckets is unlikely to be divisible by it (and in fact, modern java HashMap implementations keep the number of b...
How to sort a list of strings?
What is the best way of creating an alphabetically sorted list in Python?
11 Answers
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Removing multiple files from a Git repo that have already been deleted from disk
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For Git 1.x
$ git add -u
This tells git to automatically stage tracked files -- including deleting the previously tracked files.
For Git 2.0
To stage your whole working tree:
$ git add -u :/
To stage just the current path:
$ git add -u .
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What resources are shared between threads?
...on in an interview what's the difference between a process and a thread. Really, I did not know the answer. I thought for a minute and gave a very weird answer.
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How do you implement a good profanity filter?
...user input, search queries, and situations where the input text can potentially contain profanity or undesirable language. Oftentimes this needs to be filtered out.
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Difference between Key, Primary Key, Unique Key and Index in MySQL
...would use indexes to improve the speed of data retrieval. An index is typically created on columns used in JOIN, WHERE, and ORDER BY clauses.
Imagine you have a table called users and you want to search for all the users which have the last name 'Smith'. Without an index, the database would have t...
How to Parse Command Line Arguments in C++? [duplicate]
...ocumentation for boost::program_options could be more complete. It is specially difficult to find out how to use files to keep the options, a critical feature.
– gatopeich
Jun 16 '11 at 10:59
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