Test whether each of the domains in the list is up or not

are-domains-up.sh

#!/usr/bin/env sh

# Uses curl to connect to www.isup.me, a website that checks if a given domain
# is up or not. The response will contain "It's just you" if the domain is up.
# If not, it will contain "It's not just you".

test $# -lt 1 && (echo "Usage: $0 domain [domain2] [domain3] ..."; exit 1;)

for domain in "$@"; do
    echo -n "$domain: "
    (curl -s "http://www.isup.me/$domain" | grep "It's just you." 1>/dev/null) && echo "It's just you" || echo "It's down"
done