32V/usr/src/cmd/group.c

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#include <grp.h>
#define	NULL	0

struct	group *getgrgid(), *grp;

main()
{
	if((grp=getgrgid(getgid())) == NULL) 
		printf("%d\n", getgid());
	else
		printf("%s\n", grp->gr_name);
}