someCommand > /dev/null 2>&1
When I saw it, I don't understand what it means since I am not good at shell script. Today, I searched online and got the answer from the following link:
http://www.xaprb.com/blog/2006/06/06/what-does-devnull-21-mean/
Below is my summary from the above blog:
Greater than (>) is for redirect, and the number 1 stands for STDOUT and 2 for STDERR, and 0 for STDIN. By default, if no number provided, it is for STDOUT (number 1). So the above script means STDOUT is redirected to /dev/null (called bit-bucket), and STDERR then is redirected to STDOUT which in turn is redirected to /dev/null. It means both STDERR and STDOUT are redirected to /dev/null eventually.
