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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/utsname.h>
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#define	ARGBEGIN	for((argv0=*argv),argv++,argc--;\
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			    argv[0] && argv[0][0]=='-' && argv[0][1];\
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			    argc--, argv++) {\
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				char *_args, *_argt, _argc;\
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				_args = &argv[0][1];\
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				if(_args[0]=='-' && _args[1]==0){\
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					argc--; argv++; break;\
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				}\
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				while(*_args) switch(_argc=*_args++)
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#define	ARGEND		}
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#define	ARGF()		(_argt=_args, _args="",\
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				(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
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#define	ARGC()		_argc
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char *argv0;
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static int started;
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static void
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prword(char *w)
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{
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	if (started)
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		putchar(' ');
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	else
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		started = 1;
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	fputs(w, stdout);
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}
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void
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main(int argc, char **argv)
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{
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	struct utsname u;
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	uname(&u);
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	if(argc == 1){
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		printf("%s\n", u.sysname);
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		exit(0);
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	}
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	ARGBEGIN {
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	case 'a':
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		prword(u.sysname);
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		prword(u.nodename);
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		prword(u.release);
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		prword(u.version);
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		prword(u.machine);
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		break;
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	case 'm':
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		prword(u.machine);
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		break;
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	case 'n':
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		prword(u.nodename);
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		break;
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	case 'r':
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		prword(u.release);
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		break;
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	case 's':
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		prword(u.sysname);
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		break;
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	case 'v':
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		prword(u.version);
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		break;
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	} ARGEND
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	printf("\n");
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	exit(0);
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}