# include "postbox.h"static char SccsId[] =	"@(#)showdbm.c	4.1	7/25/83";typedef struct { char *dptr; int dsize; } datum;datum	firstkey(), nextkey(), fetch();char	*filename = ALIASFILE;main(argc, argv)	char **argv;{	datum content, key;	if (argc > 2 && strcmp(argv[1], "-f") == 0)	{		argv++;		filename = *++argv;		argc -= 2;	}	if (dbminit(filename) < 0)		exit(EX_OSFILE);	argc--, argv++;	if (argc == 0) {		for (key = firstkey(); key.dptr; key = nextkey(key)) {			content = fetch(key);			printf("\n%s:%s\n", key.dptr, content.dptr);		}		exit(EX_OK);	}	while (argc) {		key.dptr = *argv;		key.dsize = strlen(*argv)+1;		content = fetch(key);		if (content.dptr == 0)			printf("%s: No such key\n");		else			printf("\n%s:%s\n", key.dptr, content.dptr);		argc--, argv++;	}	exit(EX_OK);}