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In a standard windows .cmd file I can send messages to stdout simply by doing:
echo message How can I send a message to stderr?
Example:
Let's say I have the script parent.cmd containing:
call child.cmd 1>>stdout.log 2>>stderr.log and a child containing:
:: Writes a message to stdout :: (which in the parent is piped to stdout.log) echo message :: Now I want to write a message to stderr :: (which in the parent is piped to stderr.log) ??? 
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The regular output is sent to Standard Out (STDOUT) and the error messages are sent to Standard Error (STDERR). When you redirect console output using the > symbol, you are only redirecting STDOUT. In order to redirect STDERR, you have to specify 2> for the redirection symbol.
You can redirect stderr to stdout by using 2>&1 , and then pipe stdout into grep . what does &1 means? To specify redirection to existing handles, use the ampersand & character followed by the handle number that you want to redirect (that is, &handle# ).
You can try redirecting the handle of STDOUT to the handle of STDERR. In your child process, perform the echo with a handle redirect:
:: Writes a message to stdout :: (which in the parent is piped to stdout.log) echo message :: Now I want to write a message to stderr :: (which in the parent is piped to stderr.log) echo message 1>&2 Microsoft 'splainin it
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