[LightDM] screwed up $PATH (emergency)

[kraxadmin]

while ago, all of a sudden my $PATH was totally hammered and I didn't know
why? but the signs were ifconfig reboot halt and common command in terminal
returned the same error "command not found". I was without clue as what
effect the $PATH. while all of the common places which PATH could be defined
were normal and nothing to dictate the new $PATH.My consult in IRC led
nowhere and everybody ignored me there.
at the end i re-install the arch again but now I have the same problem all
over again. now I checked and recheck but all the same. but while I checked
deeper i found that in TTY all thing are normal for example the reboot will
restart and Ifconfig will report back.
and the problem was I installed LightDM in both cases
and after that my $PATH was gone.
HOW could I fix the $PATH???
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