. string operators
.. value length operator
.. use default value operator
.. greedyness in truncate and shift operators
. flow control
.. if statements
.. elif
.. else
.. case
.. for
.. while
. functions
.. local
. test operators
. here-docs
. arrays
.. @, *, #, !
.. assign
... per element, compound
.. use elements
. subshell
. argument handling

. variables
.. $@
.. $*
.. $#
.. $[[:digit:]]
.. $PIPESTATUS
.. $?
.. $IFS
.. $0
.. $FUNCNAME