Setting option: help (no value)
See docs/changes/index.html for recent updates.
See docs/faq.html for problems.
See docs/manualpages/index.html for help. 
 -version: prints PETSc version
 -help intro: prints example description and PETSc version, and exits
 -help: prints example description, PETSc version, and available options for used routines
-help