batch.md

REM This is a comment

REM This is turns off auto echo
@echo off  

echo:    This gets printed, considering the leading spaces.

REM This guarantees the terminal properly print the PT-BR encoding (windows-1252)
chcp 1252 > nul

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Get all files and modified date into result.txt

Check in the last 5 mins, create variable

dir /T:W /O:D /S /P "" | findstr /R "[0-9][0-9]:[0-9][0-9]" > result.txt
for /f "tokens=1,2,3,4" %a in (result.txt) do @(if "%a"=="%DATE%" (
    set stored_time=10:35
    set "current_hours=%time:~0,2%"
    set "current_minutes=%time:~3,2%"
    set "stored_hours=%b:~0,2%"
    set "stored_minutes=%b:~3,2%"
    set /a "diff = (current_hours - stored_hours) * 60 + (current_minutes -  stored_minutes)"
    if %diff% LEQ 5 (echo "%a %b %d")
    )

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IN SHORT:
! is a more powerful % used to call variables outside blocks (like for) where they were defined. For this to work, one needs to "setlocal enabledelayedexpansion"

When to use ! in batch?
First of all: The delayed variable expansion has to be set (setlocal EnableDelayedExpansion) in order to be even able to use exclamation marks instead of percent signs.

Why delayed expansion?
Normally variables are expanded to their value before a command line (or an in parentheses enclosed block of command lines) is executed. That means you can't access the new value of a variable if it was changed during the runtime of a command line or block. To avoid this "early" expansion you have to enable the delayed variable expansion and enclose variable names in ! rather than %.

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'echo' prints things
IF EXIST filename.txt (echo exists!) ELSE (echo it doesnt exist!) dir src /b /s *.java > sources.txt <- saves to sources.txt all paths that end up with *.java and also their directories

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COMMENTING IN BATCH
A batch file can be commented using either two colons :: or a REM command. The main difference is that the lines commented out using the REM command will be displayed during execution of the batch file (can be avoided by setting @echo off ) while the lines commented out using :: , won't be printed.

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TIMER - AFTER 5 SECONDS, CHOICES "yes" AND RETURN NULL
choice /d y /t 5 > nul

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@echo off
echo Hi, I'm doing some stuff
echo OK, now I need to take a breather for 1 second...
choice /d y /t 5 > nul
echo Times up! Here I go again...
pause > null

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RENAME ALL:

@echo off
dir
setlocal enabledelayedexpansion

echo: __________________________________________
set /p Pattern_input="  Pattern: "
echo:
set /p Replace_input="  Replace: "
echo: __________________________________________

set "Pattern=%Pattern_input%"
set "Replace=%Replace_input%"


echo:
for %%F in (*) do (
                   set "File=%%~F"
                   echo: %%F
                   echo: !File:%Pattern%=%Replace%!
                   echo:
                   ren "%%F" "!File:%Pattern%=%Replace%!"
                   )

echo:
echo:
echo: Pressione qualquer tecla para continuar
pause > nul

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Iteratables start with %% "@command" runs command without echoing its output

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