I have written a Unix shell script to call Growl -- here's the source. My script is named growl, and I keep a copy in $HOME/bin. I generally use my Growl script to notify me when a long-running Unix script finishes. If you are imaginative, you could have a cron job that calls Growl when disk space is low:
[robg adds: I haven't tested this one.]
#!/bin/sh
df -m / | awk '
/Filesystem/ { next }
200 > $4 { system("growl root only has " $4 "MB available") }
'#!/bin/sh
if ! ping -c 1 -t 10 critical.system.com; then
growl critical.system.com is off-line
fi
#!/bin/sh
while ! ping -c 1 -t 2 remote.site.com
do
sleep 60
done
growl remote.site.com is available[robg adds: I haven't tested this one.]
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