Shell Symbols

$#	csh, sh	Number of arguments to script
$*	csh, sh	Arguments to script
$@	sh	Original arguments to script
$-	sh	Flags passed to shell
${array[@]}		leads to each element of the array being treated as a separate shell-word
${array[*]}		results in a single shell-word with all of the elements of the array separated by spaces (or whatever the first character of IFS is)

Difference between $@ and $*

$@

./test_shell "w1 w2" w3 w4

$@ will be
w1 w2
w3
w4

$*

./test_shell "w1 w2" w3 w4

$* will be
w1 w2 w3 w4