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What is the difference between save and insert in Mongo DB?
... essentially do an upsert (update if it finds the doc, insert otherwise):
http://docs.mongodb.org/manual/reference/method/db.collection.save/#db.collection.save
Insert is just that, a straight insert.
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Passing argument to alias in bash [duplicate]
...lpr \!* -Pps5'
print part1.ps glossary.ps figure.ps
(Examples taken from http://unixhelp.ed.ac.uk/shell/alias_csh2.1.html .)
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CloudBase 拓展：App接入腾讯云 BaaS（Backend as a Service，后端即服务）...
...n
服务器地域：domestic(国内)或international(海外)
Timeout
HTTP请求超时时间（毫秒）
UserId
用户ID，登录成功后自动存储
Events
AnonymousSignInSuccess()
匿名登录成功。AccessToken已自动存储
CaptchaDataSuccess(response...
Pure JavaScript Send POST Data Without a Form
...eshing the page using only pure JavaScript (not jQuery $.post() )? Maybe httprequest or something else (just can't find it now)?
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Best algorithm for detecting cycles in a directed graph [closed]
...bly "use a library", but failing that the following Wikipedia article:
http://en.wikipedia.org/wiki/Topological_sorting
has the pseudo-code for one algorithm, and a brief description of another from Tarjan. Both have O(|V| + |E|) time complexity.
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Bash continuation lines
...gh.)
cat <<-____HERE
continuation
lines
____HERE
See also http://ss64.com/bash/syntax-here.html
If you need to preserve some, but not all, leading whitespace, you might use something like
sed 's/^ //' <<____HERE
This has four leading spaces.
Two of them will be remo...
“Inner exception” (with traceback) in Python?
...ext manager using that to catch and change your exception on the fly:
(see http://docs.python.org/3.1/library/stdtypes.html for expanation of how they work)
try: # Wrap the whole program into the block that will kill __context__.
class Catcher(Exception):
'''This context manager re...
Sending HTML email using Python
...an HTML version).
text = "Hi!\nHow are you?\nHere is the link you wanted:\nhttp://www.python.org"
html = """\
<html>
<head></head>
<body>
<p>Hi!<br>
How are you?<br>
Here is the <a href="http://www.python.org">link</a> you w...
How to split a string literal across multiple lines in C / Objective-C?
... a tiny tool to convert text to an escaped multi-line Objective-C string:
http://multilineobjc.herokuapp.com/
Hope this saves you some time.
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Convert SVG to image (JPEG, PNG, etc.) in the browser
...:
Use the canvg JavaScript library to render the SVG image using Canvas: https://github.com/gabelerner/canvg
Capture a data URI encoded as a JPG (or PNG) from the Canvas, according to these instructions: Capture HTML Canvas as gif/jpg/png/pdf?
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