-b file_prefix set filename prefix (default "y.")
-B create a backtracking parser
-d write definitions (.tab.h)
+ -h print this help-message
-H defines_file write definitions to defines_file
-i write interface (y.tab.i)
-g write a graphical description
-t add debugging support
-v write description (y.output)
-V show version information and exit
+
+Long options:
+ --defines -H
+ --file-prefix -b
+ --graph -g
+ --help -h
+ --name-prefix -p
+ --no-lines -l
+ --output -o
+ --version -V