bash String Operators

• There is also ${#variable}, which returns the length of the string in variable.

• It can also be used to determine the number of active elements in an array: ${#array[*]}.

• For $* or $@, use $# for the number of positional parameters.

• The array subscripts * and @ are subtly different:

• * elements in double quotes form a single token ( i.e. "a b c d" )

• @ elements in double quotes form a list of tokens ( i.e. "a" "b" "c" "d" )