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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main(int argc,char *argv[]) {
uid_t euid;
gid_t egid;
if(getpeereid(argc>1?atoi(argv[1]):0,&euid,&egid) == -1) return 1;
printf("%d\n%d\n",euid,egid);
return 0;
}
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