why can't I run CMD for command like this:

Question

for /f %%i in ('someprogram %1 2>&1 | find /c "some string"') do ...

it says

2>&1 was unexpected at this time

Answer 1

You will need to escape special characters within the for command:

for /f %%i in ('someprogram %1 2^>^&1 ^| find /c "some string"') do ...

cmd's parser is not the most robust one; this is unfortunately necessary.