• Renames files in ascending order.
• Allows setting the starting number for renaming.
• Allows specifying the file type to rename.

./renamer.sh -a <starting_number> -t <filetype>

• -a <starting_number>: The number from which the renaming should start.
• -t <filetype>: The file extension/type to rename without the dot character (e.g. "JPG", not ".JPG").

To rename all .JPG files in the current directory starting from 0001.JPG, run: ./renamer.sh -a 1 -t JPG

• Bash shell

1. Clone the repository or download the script.
2. Make the script executable: chmod +x renamer.sh

The script uses the getopts command to parse the command-line arguments and then renames files using a loop. The new filenames are generated in the format XXXX.<filetype> where XXXX is a zero-padded number starting from the specified starting_number.