> Cc: tech-kern@NetBSD.org

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

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

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