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Hash collision in git
...y Paradox" or "Birthday Problem", which states that when you pick randomly from a given set, you need surprisingly few picks before you are more likely than not to have picked something twice. But "surprisingly few" is a very relative term here.
Wikipedia has a table on the probability of Birthday P...
Linux equivalent of the Mac OS X “open” command [closed]
I've found the "open" command in Mac OS X very handy in the command line. From "man open":
7 Answers
...
How to sparsely checkout only one single file from a git repository?
How do I checkout just one file from a git repo?
21 Answers
21
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How to convert a ruby hash object to JSON?
...ndefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
# from (irb):11
# from /usr/bin/irb:12:in `<main>'
require 'json'
# => true
car.to_json
# => "{"make":"bmw","year":"2003"}"
As you can see, requiring json has magically brought method to_json to our Hash.
...
Semicolons superfluous at the end of a line in shell scripts?
...ne are not superfluous and are definitely not the same thing as new lines.
From the Bash Reference Manual
Commands separated by a ‘;’ are executed sequentially; the shell waits
for each command to terminate in turn. The return status is the exit
status of the last command executed.
Commands th...
How do I add a path to PYTHONPATH in virtualenv
... a path to the PYTHONPATH environment variable, that would be only visible from a particular virtualenv environment.
5 Ans...
Spring MVC: Complex object as GET @RequestParam
...
I will add some short example from me.
The DTO class:
public class SearchDTO {
private Long id[];
public Long[] getId() {
return id;
}
public void setId(Long[] id) {
this.id = id;
}
// reflection toString from a...
When should I use mmap for file access?
...great if you have multiple processes accessing data in a read only fashion from the same file, which is common in the kind of server systems I write. mmap allows all those processes to share the same physical memory pages, saving a lot of memory.
mmap also allows the operating system to optimize p...
why windows 7 task scheduler task fails with error 2147942667
... Scheduled Task
Switch to "Actions" tab
Open your Action
Remove Quotes (") from the field "Start in (optional)"
Save and close all open dialogs
To get the relevant error message:
1) Convert 2147942667 to hex: 8007010B
2) Take last 4 digits (010B) and convert to decimal: 267
3) Run: net helpms...
Disable migrations when running unit tests in Django 1.7
...igrate" command treats
an app as unmigrated, and creates tables directly from the models just
like syncdb did in 1.6. I defined a new settings module just for unit
tests called "settings_test.py", which imports * from the main
settings module and adds this line:
MIGRATION_MODULES = {"my...