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Crontab Day of the Week syntax
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0 and 7 both stand for Sunday, you can use the one you want, so writing 0-6 or 1-7 has the same result.
Also, as suggested by @Henrik, it is possible to replace numbers by shortened name of days, such as MON, THU, etc:
0 - Su...
Detect encoding and make everything UTF-8
I'm reading out lots of texts from various RSS feeds and inserting them into my database.
24 Answers
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Are custom elements valid HTML5?
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The Custom Elements specification is available in Chrome and Opera, and becoming available in other browsers. It provides a means to register custom elements in a formal manner.
Custom elements are new types of DOM elements that can be defined by
authors. Unlike decorators, which ...
What is the difference between 127.0.0.1 and localhost
...hen (intelligent) software will just turn that directly into an IP address and use it. Some implementations of gethostbyname will detect the dotted format (and presumably the equivalent IPv6 format) and not do a lookup at all.
Otherwise, the name has to be resolved. And there's no guarantee that yo...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
I want to pause input in a shell script, and prompt the user for choices.
The standard Yes , No , or Cancel type question.
How do I accomplish this in a typical bash prompt?
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Evaluating a mathematical expression in a string
...ppend(toks[0])
def pushUMinus(self, strg, loc, toks):
if toks and toks[0] == '-':
self.exprStack.append('unary -')
def __init__(self):
"""
expop :: '^'
multop :: '*' | '/'
addop :: '+' | '-'
integer :: ['+' | '-'] '0'..'9'+
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What are the best practices for using a GUID as a primary key, specifically regarding performance?
...have an application that uses GUID as the Primary Key in almost all tables and I have read that there are issues about performance when using GUID as Primary Key. Honestly, I haven't seen any problem, but I'm about to start a new application and I still want to use the GUIDs as the Primary Keys, but...
Using Java with Nvidia GPUs (CUDA)
I'm working on a business project that is done in Java, and it needs huge computation power to compute business markets. Simple math, but with huge amount of data.
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The difference between the 'Local System' account and the 'Network Service' account?
...the COM object. The error returned from the COM object creation is not a standard COM error (I think it's specific to the COM object being created).
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What is the difference between URI, URL and URN? [duplicate]
What's the difference between an URI, URL and URN? I have read a lot of sites (even Wikipedia) but I don't understand it.
4...