Topic: quota program path

[meelis]

I wont to show users they inbox folder size.
Something like this: used 5mb free 5 mb
I found horde portal block gonfiguration this:
ccount Info Configuration
* What driver should we use?:    localhost or lDAP or 0
* Path to the quota program:    /usr/bin/quota
* Path to the grep program :   /bin/grep
* Should we translate home directories to mount point device names?    
* File to translate directory names to mount point device names?:/etc/mtab
What thats mean and what is the correct quota program path?