Write a bash script that performs the following steps:$1.$ Accepts a list of filenames $($at least three$)$ as command$-$line arguments. If no filenames are provided, exit the script with an error message$\mathrm{.}2.$ Verify if each file exists. If a file does not exist, print a warning message and skip to the next file$\mathrm{.}3.$ Create a timestamped directory $($e$.$g$.,$ "backup$\_$YYYYMMDD$")$ in the current directory to store the backups$\mathrm{.}4.$ For each specified file:$4$a$.$ Copy the file into the backup directory$\mathrm{.}4$b$.$ Rename the copied file in the backup directory to include a timestamp in its filename, for example, "file.txt$"$ should become "file.txt$\_$YYYYMMDD$"\mathrm{.}4$c$.$ After all files are processed, create a simple log file in the backup directory. This log should list the original filenames and their new names in the backup directory$\mathrm{.}5.$ At the end of the script, display a message indicating the completion of the backup process and the location of the backup directory.