io - Contents of text file magically deletes self, using shell to save file -

what i'm doing

my code pulls resolution of screen , saves text file.
can @ content cat or open in text editor.

problem

however after few seconds (even if never open file), contents of text vanish , 9 bite file becomes 1 bite file , empty.

i'm @ loss, info?

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my code:

savedir=/users/myname/documents/geeklets/displays_temp.txt rezold=$(</users/myname/documents/geeklets/displays_temp.txt)  echo "$rezold" rez=$(xdpyinfo | grep dimensions | awk '{print $2}' | awk -fx '{print $1, $2}') echo "$rez" > "$savedir"  if [ "$rezold" != "$rez" ];     if [ "$rez" == "1280 777" ];         osascript /users/myname/documents/geeklets/smallscreen.scpt      else         osascript $home/scripts/geeklets/largescreen.scpt     fi   fi