# ./turbo 
TURBO is now on


# ./turbo 
TURBO is now off


# cat -n /etc/turbo.conf 
     1  #
     2  # turbo.conf
     3  #
     4  # Configuration parameters for turbo.
     5  # Do NOT edit this file by hand -- use turbo(1m) instead.
     6  #
     7  TURBO=off