B0 {-d} progname [WHEN [-x|-env] conditional expression]
   {-e}
Set a breakpoint at the first executable line of 'progname'. 

[-d: disable the breakpoint]
[-e: enable the breakpoint]

when-phrase specifies a break condition

the conditional expression has the following format:

{ value1 >  value2 }
         >=
         <
         <=
         =
         !=
         
{ ! cond1          }

{   cond1 && cond2  }
          ||     

where value1 and value2 are variable names, arithmetical expressions or constants, cond1 and cond2 are conditional expressions

The string constants must be delimited by '"'. 

If the -env option is specified, the variable names must be related to environment variables.

If the -x option is specified, the constants must be hexadecimal strings.  

The supported arithmetical operators are +,-,*,/