tcsh provides one-dimensional array variables. Any variable may be used as an array; the set builtin will explicitly declare an array.
An array is created automatically if any variable is assigned to using the syntax
set name[subscript]=word ...
The subscript is treated as an arithmetic expression that must evaluate to a number greater than or equal to zero.
The tcsh shell also provides the following syntax:
@ Print the values of all shell variables.
@ name = expr Assign the value of expr to name.
@ name[index] = expr Assign the value of expr to the index'th component of name
both name and its index'th component must already exist.
@ name++|-- Increment ('++') or decrement ('--') name
@ name[index]++|-- Increment ('++') or decrement ('--') its index’th component.
expr may contain the operators *, +, etc., as in C. If expr contains <, >, & or ' then at least that part of expr must be placed within ().
The space between '@' and name is required.
The spaces between name and '=' and between '=' and expr are optional.
Components of expr must be separated by spaces.
Referencing an array variable without a subscript is equivalent to referencing element zero.
The unset builtin is used to destroy arrays:
unset name[subscript] destroys the array element at index subscript.
unset name, where name is an array, removes the entire array.
set - Set a shell variable = value.
unset - Remove variable or function names