In the example below, the append symbol is between the dir command and the output file that stores the output.
dir > dirout.txt
In this example, instead of displaying the dir command to the screen, all output is stored in the dirout.txt file. In Linux, you can replace the dir command with the ls command to achieve the same results.
In the following example, the command appends "this is an example" to the end of the test.txt file using echo and two append symbols next to each other.
echo this is an example >> test.txt