chkshsgr.c

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#include <sys/types.h>
#include <unistd.h>
#include <grp.h>
#include "exit.h"
 
int main()
{
  gid_t x[4];
 
  x[0] = x[1] = 0;
  if (getgroups(1,x) == 0) if (setgroups(1,x) == -1) _exit(1);
  _exit(0);
}