How to store the result of a command expression in a variable using bat scripts?

Question

I have the command below to count all directories that that follow the pattern 20?????? :

\'dir /b \"20??????\" | find /c \"2\"\'

Answer 1

set cmd="dir /b "20??????" | find /c "2" "

FOR /F "tokens=*" %%i IN (' %cmd% ') DO SET X=%%i