<< -- a binary operator (file output, ...)

Ways to use symbol << :

<< Thing -- see File << Thing -- print to a file
File << Manipulator -- see File << Thing -- print to a file
File << Net -- see File << Thing -- print to a file
File << String -- see File << Thing -- print to a file
File << Symbol -- see File << Thing -- print to a file
File << Thing -- print to a file
Nothing << Manipulator -- see File << Thing -- print to a file
Nothing << Thing -- see File << Thing -- print to a file
String << Thing -- see File << Thing -- print to a file
CC << ZZ -- see left shift
RR << ZZ -- see left shift
RRi << ZZ -- see left shift
ZZ << ZZ -- see left shift
List << List -- component-wise comparison of lists
NetFile << Manipulator -- see NetFile -- the class of all net files
NetFile << Net -- see NetFile -- the class of all net files
NetFile << String -- see NetFile -- the class of all net files
Program << Thing -- run program with input redirection

For the programmer

The object << is a keyword.

This operator may be used as a binary operator in an expression like x<<y. The user may install binary methods for handling such expressions with code such as

         X << Y := (x,y) -> ...

where X is the class of x and Y is the class of y.

This operator may be used as a prefix unary operator in an expression like <<y. The user may install a method for handling such expressions with code such as

           << Y := (y) -> ...

where Y is the class of y.