how to write a bash script code example

Example 1: bash write

# syntax (note: the -e switch is to allow for backslash escapes)
# echo -e "<string-to-append>" >> <file-to-append-to>

# example 
echo -e "Hello there, new line!" >> RandomWorld.txt

# -----------------------------------------------
# In order to see the effect of -e, use the following string:
# "Hello there,\n new line!"

Example 2: how to create a bash script

echo "Hello, world!"