[gentoo-user] Script to tar.tgz /etc, works run manually, broken when run from cron

[Tanstaafl]

Hi all,

Ok, this is really irritating me...
I have a script that simply performs some backups. The commands are like 
this:

# perform tar.tgz backup of /etc
tar -czpvf $BKUP_DIR_etc/$BKUP_DateTime-dev-ecat-etc.tgz /etc

When I run this script manually, it does what it is supposed to, and the 
resulting file is about 500K.

When it runs from cron (roots crontab), it results in a 20 byte (empty) 
file.

So what am I missing/doing wrong?