c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main() {
    char *line;
    size_t line_size = 100;
    line = malloc(line_size);
    do
    {
      printf("%s", "wish> ");
      getline(&line,&line_size,stdin);
      if (strcmp(line, "exit\n") != 0) {
        line[strcspn(line, "\n")] = 0;

        char *argv_for_program[10];
        char separator[2] = " ";

        char *name_of_program;
        name_of_program = strtok(line, separator);
        argv_for_program[0] = name_of_program;

        char *arg;
        size_t arg_size = 20;
        arg = malloc(20);
        int i = 1;
        while( arg != NULL ) {
          arg = strtok(NULL, separator);
          argv_for_program[i] = arg;
          i++;
        }
        free(arg);

        char path[100] = "/usr/bin/";
        strcat(path, name_of_program);

        fork();
        int check = execv(path , argv_for_program);
        printf("%d\n",check);
        exit(0);
      }
    } while (strcmp(line, "exit\n") != 0);

    free(line);
}