void usage(void)
{

fprintf(stdout, "Usage: %s [options] cmd [args] \
       where [options] are one or more of:  \
       -h              show this help screen  \
       -q              quiet:  don't emit PID  \
       -p pidfile      write pid of child into <pidfile> (implies -q)  \
       -P PATH         set PATH to <PATH>  \
       -c dir          chdir() to <dir> before running <cmd> \
       -u umask        set umask to <umask> before running <cmd>; default 022 \
       -e envvar       pass <envvar> through to <cmd>  \
       -C fd           don't close <fd> (can be repeated)  
", prog);



/*