WRspice includes a script parsing and execution facility, which uses a syntax similar to that of the UNIX C-shell and will be described in 3.15. Statements which are interpreted and executed by this facility can be included in circuit files through use of the .exec and .control tokens. These statements are enclosed in a block beginning with .exec or .control and ending with .endc. The .exec, .control, and .endc lines contain only the keyword.