envrun.c

#include "stdio.h"
#include "stdlib.h"
#include "unistd.h"

void usage() {
    printf("Usage: environment command [arguments]\n");
    exit(1);
}

int main(int argc, char **argv) {
    if (argc < 3)
        usage();
    char* env = argv[1];
    char* prog = argv[2];
    chdir(env);
    char** args = argv + 2;
    execvp(prog, args);
}