#   Application  - .    
# ,     :
# main                  -   
# arg_<_>     -  .   
#                        .
#
#   ;)
#
#   ,    :
# verbose(<>[,<>[,<>]])           
# warning(<>[,<>[,<>]])           
# fatal(<>[,<>[,<>][,<>]])   
#
#   -   .       -
# ..       .
# 
#    :
# 
# 0 - . 
# 1 -  , , ,  ,  ..
# 2 -   
# 3 -    
# 4 -   (   ,  )
# 5 -   
# 10+ - .
# 
#  0-1-2-3   .
#
#   -    .
#
#   -      
# ( system  popen).
