[Samba] dfree command error

[Szalka Tamas]

Hi!
I'd like to use the "dfree command" option of samba because the amount of free space shown by the windows client is very far from the real values.
I've written a quite similar script to the one in man smb.conf to calculate the free space left in a share. Here is it:

#$/bin/bash
df -k | awk 'BEGIN{total=0; free=0} {if ($6~/\/myshare*/) {total+=$2; free+=$4}} END {printf total" "free}'

I have a couple of hard drives mounted under /myshare, and I want to summarize the free spaces on them. 
The script works when started from the prompt.
In the smb.conf I have the line: dfree command = /usr/local/samba/dfree #here is the script
In the smbd log these messages appeared:

[2003/07/25 17:26:13, 3] smbd/dfree.c:disk_free(92)
   disk_free: Running command /usr/local/samba/dfree .
[2003/07/25 17:26:13, 3] smbd/dfree.c:disk_free(121)
   disk_free: sys_popen() failed for command /usr/local/samba/dfree .. Error was : No child processes

Do you have any ideas to solve this?

Thanks 
Tom