any explanation for thsi shell script behaviour

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yapp

YAPP(1) 						User Contributed Perl Documentation						   YAPP(1)

NAME

       yapp - A perl frontend to the Parse::Yapp module

SYNOPSYS

       yapp [options] grammar[.yp]

       yapp -V

       yapp -h

DESCRIPTION

       yapp is a frontend to the Parse::Yapp module, which lets you compile Parse::Yapp grammar input files into Perl LALR(1) OO parser modules.

OPTIONS

       Options, as of today, are all optionals :-)

       -v  Creates a file grammar.output describing your parser. It will show you a summary of conflicts, rules, the DFA (Deterministic Finite
	   Automaton) states and overall usage of the parser.

       -s  Create a standalone module in which the driver is included.	Note that if you have more than one parser module called from a program,
	   to have it standalone, you need this option only for one of your parser module.

       -n  Disable source file line numbering embedded in your parser module.  I don't know why one should need it, but it's there.

       -m module
	   Gives your parser module the package name (or name space or module name or class name or whatever-you-call-it) of module.  It defaults
	   to grammar

       -o outfile
	   The compiled output file will be named outfile for your parser module.  It defaults to grammar.pm or, if you specified the option -m
	   A::Module::Name (see below), to Name.pm.

       -t filename
	   The -t filename option allows you to specify a file which should be used as template for generating the parser output.  The default is
	   to use the internal template defined in Parse::Yapp::Output.pm.  For how to write your own template and which substitutions are
	   available, have a look to the module Parse::Yapp::Output.pm : it should be obvious.

       -b shebang
	   If you work on systems that understand so called shebangs, and your generated parser is directly an executable script, you can specifie
	   one with the -b option, ie:

	       yapp -b '/usr/local/bin/perl -w' -o myscript.pl myscript.yp

	   This will output a file called myscript.pl whose very first line is:

	       #!/usr/local/bin/perl -w

	   The argument is mandatory, but if you specify an empty string, the value of $Config{perlpath} will be used instead.

       grammar
	   The input grammar file. If no suffix is given, and the file does not exists, an attempt to open the file with a suffix of  .yp is tried
	   before exiting.

       -V  Display current version of Parse::Yapp and gracefully exits.

       -h  Display the usage screen.

BUGS

       None known now :-)

AUTHOR

       Francois Desarmenien <francois@fdesar.net>

COPYRIGHT

       (c) Copyright 1998-1999 Francois Desarmenien, all rights reserved.  See Parse::Yapp(3) for legal use and distribution rights

SEE ALSO

       Parse::Yapp(3) Perl(1) yacc(1) bison(1)

perl v5.12.1							    2001-02-11								   YAPP(1)

Shell Programming and Scripting