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Catching error codes in a shell pipe
..../a failed" 1>&2
fi
rm -f $tmp.[12]
The '1>&2' redirection can also be abbreviated '>&2'; however, an old version of the MKS shell mishandled the error redirection without the preceding '1' so I've used that unambiguous notation for reliability for ages.
This leaks files if y...
What is the difference between Ruby 1.8 and Ruby 1.9
... interest of bringing this information inline for easier reference, and in case the link goes dead in the abstract future, here's an overview of Sam's slides. The slideshow is less overwhelming to review, but having it all laid out in a list like this is also helpful.
Ruby 1.9 - Major Features
Pe...
Flask vs webapp2 for Google App Engine
I'm starting new Google App Engine application and currently considering two frameworks: Flask and webapp2 . I'm rather satisfied with built-in webapp framework that I've used for my previous App Engine application, so I think webapp2 will be even better and I won't have any problems with it.
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Reading output of a command into an array in Bash
...-r: this is important. It tells read to not interpret the backslashes as escape sequences.
-d '': please note the space between the -d option and its argument ''. If you don't leave a space here, the '' will never be seen, as it will disappear in the quote removal step when Bash parses the statement...
Tying in to Django Admin's Model History
... use the code from Marty Alchin in his book Pro Django (see Keeping Historical Records starting at page 263). There is an application django-simple-history which implements and extends this approach (docs here).
share
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User Authentication in ASP.NET Web API
...e client that consumes JSON data from somewhere. I chose Web API from MS because it seemed easy enough but when it comes to authenticating users, things get quite frustrating.
...
Method Resolution Order (MRO) in new-style classes?
...he "naive", depth-first approach -- e.g., consider a "diamond inheritance" case:
>>> class A: x = 'a'
...
>>> class B(A): pass
...
>>> class C(A): x = 'c'
...
>>> class D(B, C): pass
...
>>> D.x
'a'
here, legacy-style, the resolution order is D - B...
git stash blunder: git stash pop and ended up with merge conflicts
...ee man git merge (HOW TO RESOLVE CONFLICTS):
After seeing a conflict, you can do two things:
Decide not to merge. The only clean-ups you need are to reset the index file to the HEAD commit to reverse 2. and to clean up working tree changes made by 2. and 3.; git-reset --hard can be used for this.
...
Why in Java 8 split sometimes removes empty strings at start of result array?
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The behavior of String.split (which calls Pattern.split) changes between Java 7 and Java 8.
Documentation
Comparing between the documentation of Pattern.split in Java 7 and Java 8, we observe the following clause being added:
When there is a positive-widt...
What is data oriented design?
...as reading this article , and this guy goes on talking about how everyone can greatly benefit from mixing in data oriented design with OOP. He doesn't show any code samples, however.
...