Write a C program to execute multiple Unix commands in parallel. . The number of Unix commands to be executed is not fixed. . There is no communication among the Unix commands. The Unix commands are given as command line arguments. . For simplicity, you can assume that cach Unix command has exactly one argument except that the last one can have either no argument or one argument. For example, > miniminishell cat openfile.c ls -t ps includes three Unix commands: cat with one argument openfile.c, ls with one argument t, and ps with no argument. For each Unix command, use a separate child process to execute it. You need to print out each process id. Submit the code and the usual script files