echo "$identifier_azAZ09"
echo "$Identifier_azAZ09"
echo "$_identifier_azAZ09"
echo "$0"
echo "$1"
echo "$2"
echo "$3"
echo "$4"
echo "$5"
echo "$6"
echo "$7"
echo "$8"
echo "$9"
echo "$@"
echo "$@"
echo "$-"
echo $# # Expands to a number
echo $? # Expands to a number
echo $$ # Expands to a number
echo $! # Expands to a number

echo "$identifier_azAZ09"
echo "$Identifier_azAZ09"
echo "$_identifier_azAZ09"
echo "${identifier_azAZ09}"a
echo "${Identifier_azAZ09}"a
echo "${_identifier_azAZ09}"a
echo "${identifier_azAZ09}a"
echo "${Identifier_azAZ09}a"
echo "${_identifier_azAZ09}a"
echo "$identifier_azAZ09/a"
echo "$Identifier_azAZ09/a"
echo "$_identifier_azAZ09/a"
echo "$identifier_azAZ09$identifier_azAZ09"
echo "$Identifier_azAZ09$Identifier_azAZ09"
echo "$_identifier_azAZ09$_identifier_azAZ09"
echo "${0}"
echo "${1}"
echo "${2}"
echo "${3}"
echo "${4}"
echo "${5}"
echo "${6}"
echo "${7}"
echo "${8}"
echo "${9}"
echo "${1}"0
echo "${10}"
echo "${@}"
echo "${-}"
echo ${#} # Expands to a number
echo ${?} # Expands to a number
echo ${$} # Expands to a number
echo ${!} # Expands to a number

echo ${#array[@]} # Expands to a number
echo "${array[0]}"
echo "${array[@]}"
echo "${array[@]}"
echo "${subst##*/}"
echo "${subst#*/}"
echo "${subst%/*}"
echo "${subst%%/*}"

echo "$identifier_azAZ09"
echo "$Identifier_azAZ09"
echo "$_identifier_azAZ09"
echo "$0"
echo "$1"
echo "$2"
echo "$3"
echo "$4"
echo "$5"
echo "$6"
echo "$7"
echo "$8"
echo "$9"
echo "$@"
echo "$*"
echo "$-"
echo "$#" # Expands to a number
echo "$?" # Expands to a number
echo "$$" # Expands to a number
echo "$!" # Expands to a number

echo "$identifier_azAZ09"
echo "$Identifier_azAZ09"
echo "$_identifier_azAZ09"
echo " ${identifier_azAZ09}"
echo " ${Identifier_azAZ09}"
echo " ${_identifier_azAZ09}"
echo "${identifier_azAZ09} "
echo "${Identifier_azAZ09} "
echo "${_identifier_azAZ09} "
echo "${identifier_azAZ09}${identifier_azAZ09}"
echo "${Identifier_azAZ09}${Identifier_azAZ09}"
echo "${_identifier_azAZ09}${_identifier_azAZ09}"
echo "${0}"
echo "${1}"
echo "${2}"
echo "${3}"
echo "${4}"
echo "${5}"
echo "${6}"
echo "${7}"
echo "${8}"
echo "${9}"
echo "${1}0"
echo "${10}"
echo "${@}"
echo "${*}"
echo "${-}"
echo "${#}" # Expands to a number
echo "${?}" # Expands to a number
echo "${$}" # Expands to a number
echo "${!}" # Expands to a number

echo "${#array[@]}" # Expands to a number
echo "${array[0]}"
echo "${array[@]}"
echo "${array[*]}"
echo "${subst##*/}"
echo "${subst#*/}"
echo "${subst%/*}"
echo "${subst%%/*}"