Hi,
(shell-command) doesn't work properly in Android apparently because it
checks for the presence of environment variable HOME and it isn't
always defined in this OS. As it doesn't find this variable it chooses
CMD.EXE for executing as if it were Windows, which obviously doesn't
work.
However PATH seems to be in all devices I've checked out. AFAIK it
also happens to be present in OsX and all Linux flavours, is that
right?
Best regards