fileread --Operation, one input. Abbreviation: fird
     The input must be a file descriptor, previously output by openread.
     The procedure reads one line from the file. The output is the line,
     in the form of a list. (That is, the output is the file line as if
     enclosed in square brackets in a program.) If the end of the file has
     been reached, the output is the empty word. If the file line contains
     mismatched brackets, trouble may result.