How can I find out if a folder exists and take an action depending on the result?

Question

SSH

I have a winscp synchronization script that works from a bat file

@echo off
del %APPDATA%\WinSCP\WinSCP.log

SET userfolder=foldername
SET server=/home/userfolder

"%APPDATA%\WinSCP\WinSCP.com" ^
  /log="%APPDATA%\WinSCP\WinSCP.log" /ini=nul ^
  /command ^
    "open sftp://user:[email protected]/ -hostkey=*" ^
  "cd %server%"^
  "mkdir %userfolder%"^
  "synchronize remote %APPDATA%\ViberPC %server%/%userfolder%/" ^
    "exit"

set WINSCP_RESULT=%ERRORLEVEL%
if %WINSCP_RESULT% equ 0 (
  echo Success
) else (
  echo Error
)

exit /b %WINSCP_RESULT%

in fact, if the folder foldername exists, then mkdir gives an error and the whole script is interrupted, how to check for the existence of the folder and, if it exists, continue the script further?

Answer 1

https://winscp.net/forum/viewtopic.php?t=15867&sid...
You can set option batch continue before mkdir to ignore any errors and restore the option batch abort after.

Answer 2

Almost verbatim - the very first case of the syntax https://ss64.com/nt/if.html

Answer 3

test ! -d /var/backup/mysql/`date +%Y` && { mkdir -p /var/backup/mysql/`date +%Y` ; }

or

FILE=/etc/resolv.conf
if ; then
    echo "$FILE exist"
fi