Cannot run commands from command prompt?

Playing around with GRASS and Python, accidentally I lost environment variable resulting that some commands, like ipconfig and ping, from command promt were not running and the error was called.
Windows system32 directory should be left as one of the PATH variables.


daily data

PHP mysql database code for wells. daily results for all wells.
Sometimes there`s a need for daily data, but in database there are records only about those days, when measurements were made.
In given example, it is possible to set the start and end days, and multiple measurement points a.k.a. wells.