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How do I uniquely identify computers visiting my web site?
... stuck.
Validation. You need to guard against spoofing, session hijacking, etc.
Even if there are ways to track a computer without using cookies there will always be a way to bypass it and software that will do this automatically. If you really need to track something based on a computer you will ...
http to https apache redirection
...ite.example.com
DocumentRoot /usr/local/apache2/htdocs
SSLEngine On
# etc...
</VirtualHost>
Then do:
/etc/init.d/httpd restart
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Single Page Application: advantages and disadvantages [closed]
...ld also
work with any updates in data like notifications, profile update etc
An alternate perspective: Aside from your website, will your project
involve a native mobile app? If yes, you are most likely going to be
feeding raw data to that native app from a server (ie JSON) and doing
cl...
Grouping functions (tapply, by, aggregate) and the *apply family
...a function to the 1st elements
of each, and then the 2nd elements of each, etc., coercing the result
to a vector/array as in sapply.
This is multivariate in the sense that your function must accept
multiple arguments.
#Sums the 1st elements, the 2nd elements, etc.
mapply(sum, 1:5, 1:5, 1:5)
[1] ...
When to use the different log levels
...diagnostically helpful to people more than just developers (IT, sysadmins, etc.).
Info - Generally useful information to log (service start/stop, configuration assumptions, etc). Info I want to always have available but usually don't care about under normal circumstances. This is my out-of-the-box c...
Facebook Architecture [closed]
...ey use. How do they scale & what are the design decisions for what they do etc. Main underpinning being to learn. Knowing about sites which handles such massive traffic gives lots of pointers for architects etc. to keep in mind certain stuff while designing new sites. I am sharing what I found.
...
Query EC2 tags from within instance
...NCE_ID" --output=text | sed -r 's/TAGS\t(.*)\t.*\t.*\t(.*)/\1="\2"/' > /etc/ec2-tags
You need the AWS CLI tools installed on your system: you can either install them with a packages section in a cloud-config file before the script, use an AMI that already includes them, or add an apt or yum com...
ALTER TABLE without locking the table?
...ferably in a transaction.
Once finished, recompile any stored procedures, etc that use that table. The execution plans will likely no longer be valid.
EDIT:
Some comments have been made about this limitation being a bit poor. So I thought I'd put a new perspective on it to show why it's how it ...
How do I set a variable to the output of a command in Bash?
... -v users[uid] "%11d %7d %-20s %s\n" $uid $gid $user $home
done {list}</etc/passwd
Then
echo -n "${users[@]}"
1000 1000 user /home/user
...
65534 65534 nobody /nonexistent
and
echo ${!users[@]}
1000 ... 65534
echo -n "${users[1000]}"
1000 1000 user ...
Automatically start forever (node) on system restart
...
This case is valid for Debian.
Add the following to /etc/rc.local
/usr/bin/sudo -u {{user}} /usr/local/bin/forever start {{app path}}
{{user}} replaces your username.
{{app path}} replaces your app path. For example, /var/www/test/app.js
...