Develop a proc_manager program that reads in the commands to execute from an input file one-by-one. You will read one command and its parameters per each line. Then the proc_manager program will start up the process and "babysit" it. You will run each command in a child process using exec and the parent process will wait for each exec to complete. For each child process there will be log messages written to output and error files, which are named after its index in the sequence of commands read in. For example, process #1 will have logs written to 1.out and 1.err. Upon start, the string "Starting command INDEX: child PID pid of parent PPID" will be logged to the corresponding output file 1.out. You can retrieve PID and PPID through the return value of fork() or getpid() or getppid(). You can use dup2() to make filehandle 1 (stdout) go to a file X. out and handle 2 (stderr) go to a file X. err. Note: new executions of a command should append to the previous output and error files, such as 1.out, rather than overwrite them. Upon finish of an exec, the process should record the finish runtime, and it should write to the output file the string "Finished at FIN, runtime duration DUR" where FIN is the finish time and DUR is the duration of the execution. Each time a process finishes, the message "Exited with exitcode = X" should be written to the error file of the process. X is the process exit code. If the process was killed with a signal, then "Killed with signal S" should be written to the error file. S is the signal number that killed the process. This information is gathered using the status parameter of the wait() system call. Here is an example run: ./proc_manager cmdfileWhere cmdfile contains:prompt> cat cmdfilesleep 5ls -latrsleep 3pwdsleep 1wc /etc/passwdall processes shouls run in parallel