> Cc: tech-kern@NetBSD.org

Hm, shouldn't this part of the discussion be somewhere else?

quoted text
>> I don't see anything wrong with having one program which accepts -c
>> and -d (or whatever options are picked) and then, for certain values
>> of basename(argv[0]), supplies one or the other by default.
> Well, I guess it would break the principle of least surprise: if the
> default is to compress,

If.  No, I think the default should be more like...

 cflag =3D 0;
 dflag =3D 0;
 if (!strcmp(basename(av[0]),"vndzip")) cflag =3D 1;
 if (!strcmp(basename(av[0]),"vndunzip")) dflag =3D 1;
 ...process command-line flags...
 ... -c -> { cflag=3D1; dflag=3D0; } ...
 ... -d -> { dflag=3D1; cflag=3D0; } ...
 if (!cflag && !dflag)
  { fprintf(stderr,"%s: must give -c or -d when not run as `vndzip' or `v=
ndunzip'\n",__progname);
    exit(1);
  }

/~\ The ASCII				der Mouse
\ / Ribbon Campaign
 X  Against HTML	       mouse@rodents.montreal.qc.ca
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B