[Tinyos-help] environmental variables in shell script

[Anton]

When I set the variables manually (typing in the cygwin shell) 
everything is OK.

When I use *.sh file with those settings, it does not work because 
variables are "overwritten", for example these two lines:

export TOSROOT="/opt/tinyos-2.x"
export TOSDIR="$TOSROOT/tos"

in the shell script cause TOSDIR value to be "/tos/tinyos-2.x", so 
instead of appending "/tos" after TOSROOT, "/tos" is written in the 
beginning (and it overwrites "/opt").

Does anybody know why this happens?