script to change file names in a folder windows code example

Example 1: change all file to another

for f in *.txt; do
    mv -- "$f" "$(basename -- "$f" .txt).text"
done

Example 2: batch rename folders

REM # (1) Rename folders (not files) in the current folder only
REM # (2) Rename folders (not files) in the current folder and its subfolders

REM # | EXAMPLE (1) 
REM # | ---------------------------------------------------------------
REM # | Replace " " with "_" for the folders in the current folder only    

@echo off
setlocal EnableDelayedExpansion
set "pattern_to_replace= "
set "replace_text=_"

for /d %%N in ("*") do (
   set "InitName=%%N"
   call set NewName=%%InitName:!pattern_to_replace!=!replace_text!%%
   
   if NOT !InitName!==!NewName! (
      echo rename "!InitName!" "!NewName!" 
      rename "!InitName!" "!NewName!"
   )
)

@echo on


REM # | EXAMPLE (2) 
REM # | ---------------------------------------------------------------
REM # | Replace " " with "_" for the folders in the current folder and all its subfolders

@echo off
setlocal EnableDelayedExpansion
set "pattern_to_replace= "
set "replace_text=_"

for /d /R "%cd%" %%N in ("*") do (
   set "InitName=%%~nN%%~xN"
   call set NewName=%%InitName:!pattern_to_replace!=!replace_text!%%

   if NOT %%N==%%~dN%%~pN!NewName! (
      echo rename "%%~dN%%~pN!InitName!" "!NewName!" 
      rename "%%~dN%%~pN!InitName!" "!NewName!"
   )
)

@echo on

REM # | ---------------------------------------------------------------

Example 3: batch rename file

REM # | EXAMPLE (changes the "ChangeMyName.txt" file's name to "NameChanged.csv")
rename "C:/Users/JacquesK/ChangeMyName.txt" "NameChanged.csv"

REM # | SYNTAX
REM # | rename "" ""