isup: simple script that query isup.me and tell you if a site is UP/DOWN (Shell script)

isup.sh

#!/bin/sh

for domain in $*; do
    curl "http://www.isup.me/$domain" 2>/dev/null | grep "It's just you" > /dev/null
    if [ $? -eq 0 ]; then
        echo "$domain: UP"
    else
        echo "$domain: DOWN"
    fi
done