Comments

Line comments:

# This is a comment
echo "This is code" # This is another comment

Multiline or block comments:

#[ This is a multi line comment
it continues until it is terminated
]#
echo "This is code"

They can be nested:

#[ This is a multi line comment
 #[
  This is a nested comment
 ]#
it continues until it is terminated
]#
echo "This is code"