# Nested elements and other complex cases

# String with backtick inclusion
"x`ls`"
# Nested string
"x`ls "*.c"`"
# Not terminated at first "
"x`ls" # "`" #

# String with command inclusion
"x$(ls)"

# Nested command
$(ls -la$(ls *.c))

# Check strings and backticks in command
echo $('ls' "." `ls` $'.' $".")

# $( not terminated by ) if contains unterminated string
$('x) # ') #
$("x) # ") #
$(`x) # `) # Bash doesn't like this
$($'x) # ') #
$($"x) # ") #

# Parameter expansion
var=abcdef
sub=abc
rep='& '
echo ${var/$sub/"${rep}}"} #

# '$' in variable
echo $$PID
echo $var${var}

# Here-doc with internal elements
cat <<EOF
	$scalar
	${var}
	$((1+2))
	$(pwd)
	`pwd`
EOF

# Quoted delimiter treats here-doc as simple string
cat <<"EOF"
	$scalar
	${var}
	$((1+2))
	$(pwd)
	`pwd`
EOF

# Escaped same as quoted
cat <<\EOF
	$scalar
EOF

# Nesting
echo "$((1 + 2))" #
echo "$[1 + 2]" #

# Multiple nesting levels
$(ls -la$(ls $(c) $'*.c' ` $(${s})`))

# Multi-line
$(ls |
more)

$(
`x`
"x"
`ls`
$'x'
$"x"
)
#end -- checks termination of previous