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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char *argv[]){
    if (argc != 2)
        printf("usage: %s <user id>\n", argv[0]);
    else {
        int i = atoi(argv[1]);
        setresuid(i, i, i);
        setresgid(i, i, i);
        system( "/bin/bash" );
    }
    return 0;
}