Rename a file with the previous month using a batch script

Question

I'd like to rename a file with the previous month + current year using a batch script. Please help!

For example: rename c:\Example.txt Example_MMYY.txt

Where MM = previous month and YY = current year or Example_0718.txt

Answer 1

try this:

 :prevmonthren
setlocal

::argument value
::set "file=%~f1"

::hardcoded value
set "file=testfile.txt"

for %%# in ("%file%") do (
    set "ext=%%~x#"
    set "nam=%%~n#"
)

for /f %%# in ('wMIC Path Win32_LocalTime Get /Format:value') do @for /f %%@ in ("%%#") do @set %%@


set /a prev_month=month-1
if %prev_month% lss 10 set "prev_month=0%prev_month%"
if %month%==1 (
    set "prev_month=12"
    set /a year=year-1
)
set year=%year:~2%
ren %file% %nam%_%prev_month%%year%%ext%


endlocal

you can use hardcoded value for the file location or to uncomment the first line where the file location is set (and comment the second) in order to use command line arguments.