$ curl cheat.sh/
 cheat:rename 
# To lowercase all files and folders in current directory:
rename 'y/A-Z/a-z/' *

# To replace 'sometext' with 'replacedby' in all files in current directory:
rename 's/sometext/replacedby/' *

 tldr:rename 
# rename
# Rename multiple files.
# NOTE: this page refers to the command from the `util-linux` package.
# For the Perl version, see `file-rename` or `perl-rename`.
# Warning: This command has no safeguards and will overwrite files without prompting.
# More information: <https://manned.org/rename>.

# Rename files using simple substitutions (substitute 'foo' with 'bar' wherever found):
rename foo bar *

# Dry-run - display which renames would occur without performing them:
rename -vn foo bar *

# Do not overwrite existing files:
rename -o foo bar *

# Change file extensions:
rename .ext .bak *.ext

# Prepend "foo" to all filenames in the current directory:
rename '' 'foo' *

# Rename a group of increasingly numbered files zero-padding the numbers up to 3 digits:
rename foo foo00 foo? && rename foo foo0 foo??

$
Follow @igor_chubin cheat.sh