Check if a file or folder exists with dos command

You can use the IF EXIST statement to check for the presence of a file or directory:

To check if the file "file.exe" exists in the directory temp:

IF EXIST c:\temp\file.exe ECHO File exists!

To check if a the directory "temp" exists (Notice the nul):

IF EXIST c:\temp\nul ECHO Directory exists! 

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how check process or application is running with Dos command

I show two simple script:

• Below check if an application is running:

@echo off
tasklist /FI "IMAGENAME eq process_app.exe" 2>NUL | find /I /N "process_app.exe">NUL
if "%ERRORLEVEL%"=="0" echo Programm is running
if "%ERRORLEVEL%"=="1" echo Programm is not running 

• Below check if a process is running:

@echo off 

tasklist /FI "SERVICES eq process_name" 2>NUL | find /I /N "process_file.exe">NUL
if "%ERRORLEVEL%"=="1" goto Process_NotFound
if "%ERRORLEVEL%"=="0" goto Process_Found 

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how check free disk space with command dos

I will show below a simple code in order to check the free disk space with few Dos commands:

@echo off
for /f "tokens=2" %%S in ('wmic volume get DriveLetter^, FreeSpace ^| findstr "^C:"') do set freeSpace=%%S
rem if the freespace is less than 1GB then execute blat.exe to send an email 

if %freeSpace% leq 1000000000 "c:\Blat\blat.exe ...." 
@echo on

rem now, show the freespace 
@echo %freeSpace%

Remember to change the drive letter, in the example I have checked the drive C.
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