main (int argc, char* argv[], char* envp[]) {

}

• argc is the number of parameters passed to the
  program, rememberthat the program name is counted as
  one of the parameters

• argv is an array of string pointers, there is one entry
  in this array for each parameter to the program, the
  parameters to a program are separated by white space,
  unless they are enclosed in quotes (" or ')

• For example

prog -x -f fred george

will produce the following:

argc = 5 argv[0] = "prog" argv[1] = "-x" argv[2] = "-f" argv[3] = "fred" argv[4] = "george" argv[5] = NULL;

• *envp is an array of pointers to strings, each string
  contains the value of one of the environment variables, the
  end of the envp array is marked by a zero entry

• *Each entry in the envp array has the following format
  
  March 3, 1998Page 10C201/TAM