The || and && operators to chain commands rely on the LHS command to be successful (or unsucessful) to decide upon launching the RHS command. Unfortunately, success/failure is not always when errorlevel is 0 (non zero). Some exmaples: - if a redirection fails (eg. appending to a non existing file), the command (builtin/external) is always unsuccessful (and the error level is untouched, - external command (when redirection is ok) is succesful when program exit code is zero, - ditto for a call to a label inside the batch file, with the 'exit /b' parameter, - it's way more complicated for builtins. Eg 'type' is unsuccessful on a non existing file, while 'dir' (on the same unexisting file) succeeds. So start adding some tests about success / failure of some commands. Signed-off-by: Eric Pouech <epouech@codeweavers.com>