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"'

For example, if I have the following directories, the command would return 6:

20090901
20090902
20090903
20090904
20090905
20090906

How can I store the result of this command (6 in the forementioned example) in a variable?

Answer 1

Here's a sample:

@echo off
set wildcard=C:\*.*
set count=0
FOR /F %%a in ('DIR /B %wildcard%') do set /A count=count+1
echo %count% files matching %wildcard%
set choice=
set /p choice=Press enter to continue ...

Answer 2

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

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