rem redirect just stdout to prog.log
javac.exe *.java > prog.log

rem redirect just stdout to prog.log, appending rather than erasing prog.log first
javac.exe *.java >> prog.log

rem redirect both stdout and stderr to err.log
javac.exe *.java >& err.log

rem redirect stdout to prog.log
javac.exe *.java 1> prog.log

rem redirect stderr to err.log
javac.exe *.java 2> err.log

rem redirect stdout to prog.log and stderr to err.log
javac.exe *.java 1> prog.log  2> err.log