Jmeter

http://biscminds.blogspot.in/2011/12/quick-jmeter-setup-on-mac.html
Open ApacheJMeter.jar to launch Jmeter

Adding conditional javascript to mobile devices

http://stackoverflow.com/questions/3514784/what-is-the-best-way-to-detect-a-handheld-device-in-jquery/10364620#10364620

Varnish | few basic things

Drupalcamp gent-2012 - varnish for dummies from wouters_frederik

Basic SVN commands those who prefer command prompt

http://openoffice.apache.org/svn-basics.html

Search symbolic link in a folder

find /folder -type l -exec ls -lad {} \;

Useful basic liux Command

Some basic UNIX command which helps in managing server

1. copy a directory
   cp -r dir1 /path/to/destination/dir
2. Extract tar.gz file
   tar xvfz archive_name.tar.gz
3. create a tar.gz file
   tar cvfz archive_name.tar.gz dirname/
4. Search file with file name
   find . -type f -name '*.php'

Linux command to see disk spaces

df -h

Linux folder size from command prompt

Best way to check folder size.

du -hs /var/www/
7.8G

If want to exclude any(upload here) folder then

du -hs --exclude=upload*
2G
 

Drupal Commerce | Change the default country

1. Go to admin/commerce/customer-profiles/types
2. Select Manage fields on the appropriate profile type
3. Select Edit for the Address field
4. Set the Available countries and the default country

Website monitoring

So, you want a tool, which will send you some kind of alert when your site is down.
And you don't want to install complicated software on your sever or client.

then here is the solution
http://www.monitor.us/about-monitor-us/monitis-premium-product