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Read a Spice3 input file
General form
source file
Read the input file file. Commands may be included in the file, and must be enclosed between the lines .control and .endc. These commands are executed immediately after the circuit is loaded, so a control line of ac ... works the same as the corresponding .ac card. The first line in any input file is considered a title line and not parsed but kept as the name of the circuit. The exception to this rule is the file .spiceinit. Thus, a command script must begin with a blank line and then with a .control line. Also, any line starting with the characters *# is considered a control line. This makes it possible to embed commands in input files that are ignored by earlier versions of Spice2.