Resolve how Echo writes a newline to a file in a shell script

Test environment: ubuntu12.04 LTS Version

Echo >> file.txt,

This method is the same as the bash and SH effects at the beginning of the script.

and Echo-e >> file.txt This only fits with bash

For SH, the-E is entered into the file and then wrapped.

and echo-e "\ n" >> file.txt for Bash for 2 consecutive lines,

For SH, the- E and a new empty line are entered into the file.

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Resolve how Echo writes a newline to a file in a shell script