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Unix Version 7 - man page for yacc (v7 section 1)

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YACC(1) 										  YACC(1)

       yacc - yet another compiler-compiler

       yacc [ -vd ] grammar

       Yacc  converts  a  context-free	grammar into a set of tables for a simple automaton which
       executes an LR(1) parsing algorithm.  The grammar may be ambiguous;  specified  precedence
       rules are used to break ambiguities.

       The output file, y.tab.c, must be compiled by the C compiler to produce a program yyparse.
       This program must be loaded with the lexical analyzer program, yylex, as well as main  and
       yyerror,  an  error handling routine.  These routines must be supplied by the user; Lex(1)
       is useful for creating lexical analyzers usable by yacc.

       If the -v flag is given, the file y.output is prepared, which contains  a  description  of
       the parsing tables and a report on conflicts generated by ambiguities in the grammar.

       If  the -d flag is used, the file y.tab.h is generated with the define statements that as-
       sociate the yacc-assigned `token codes' with the user-declared `token names'.  This allows
       source files other than y.tab.c to access the token codes.

       y.tab.h		   defines for token names
       yacc.tmp, yacc.acts temporary files
       /usr/lib/yaccpar    parser prototype for C programs
       /lib/liby.a	   library with default `main' and `yyerror'

       LR Parsing by A. V. Aho and S. C. Johnson, Computing Surveys, June, 1974.
       YACC - Yet Another Compiler Compiler by S. C. Johnson.

       The number of reduce-reduce and shift-reduce conflicts is reported on the standard output;
       a more detailed report is found in the y.output file.  Similarly, if some  rules  are  not
       reachable from the start symbol, this is also reported.

       Because	file names are fixed, at most one yacc process can be active in a given directory
       at a time.

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