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What does 'foo' really mean?
...Etymology of "Foo", D. Eastlake 3rd et al.
Quoting only the relevant definitions from that RFC for brevity:
Used very generally as a sample name for absolutely anything, esp.
programs and files (esp. scratch files).
First on the standard list of metasyntactic variables used in
synt...
Can I use GDB to debug a running process?
...tack).
The command may take as argument a process id, a process name
(with an optional process-id as a suffix), or a device file.
For a process id, you must have permission to send the process a signal,
and it must have the same effective uid as the debugger.
When using "attach" to an exis...
kill -3 to get java thread dump
...
You could alternatively use jstack (Included with JDK) to take a thread dump and write the output wherever you want. Is that not available in a unix environment?
jstack PID > outfile
share
...
Ignoring new fields on JSON objects using Jackson [duplicate]
...nd have new fields added while the application is published, but currently it will break even when a simple String field is added, which can safely be ignored.
...
Difference between dispatch_async and dispatch_sync on serial queue?
...nly return after the block is finished whereas dispatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 bu...
Multiline strings in VB.NET
...
You can use XML Literals to achieve a similar effect:
Imports System.XML
Imports System.XML.Linq
Imports System.Core
Dim s As String = <a>Hello
World</a>.Value
Remember that if you have special characters, you should use a CDATA...
Ways to implement data versioning in MongoDB
...imple query. So by keeping the history out of the object you can also keep it out of the commonly accessed memory when that data is queried.
To make my life easy, I would make a history document contain a dictionary of time-stamped diffs. Something like this:
{
_id : "id of address book record...
How to execute a Python script from the Django shell?
...follow
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edited Jun 22 '17 at 8:00
Jonathan
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Sorting arraylist in alphabetical order (case insensitive)
...follow
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edited Mar 17 '17 at 0:39
grg
3,26233 gold badges2626 silver badges3838 bronze badges
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How to safely upgrade an Amazon EC2 instance from t1.micro to large? [closed]
...
From my experience, the way I do it is create a snapshot of your current image, then once its done you'll see it as an option when launching new instances. Simply launch it as a large instance at that point.
This is my approach if I do not want any downtim...