how to rename multiple files in bash code example

Example: bash rename multiple files

# Basic syntax using rename:
rename search_string replacement_string files

# Example usage:
# Say you have a directory containing the following files:
badly_name_file_1.txt
badly_named_file_1.txt
badly_named_file_2.txt
badly_named_file_3.png

rename txt png *txt # This would change all extensions to .png, e.g.:
badly_name_file_1.png
badly_named_file_1.png
badly_named_file_2.png
badly_named_file_3.png

# *txt returns all files that end in txt and then if txt is found in the
#	file name, it gets replaced with png

rename named speled badly* # This would change named to speled in all
#	files that begin with badly, e.g.:
badly_name_file_1.txt # This one is skipped because it doesn't have named
badly_speled_file_1.txt
badly_speled_file_2.txt
badly_speled_file_3.png