Bash script to check if a site is online (via ping) every X seconds until it is back online.

nagsite.sh

#!/usr/bin/env sh

# nagsite.sh - ping a site until it comes back online

RET_VAL=1;

#
# checksite - Check if a site is online
#      args - url to ping
#   returns - no returns, but modifies RET_VAL
#             to store return value of ping
function checksite(){
    echo "Checking site $1"
    ping -c 1 $1 > /dev/null
    RET_VAL=$?
    if [[ $RET_VAL = 0 ]]; then
    	say "$1 is online"
    	echo "$1 is online"	
    else
    	# say "$1 is offline"
    	echo "$1 is offline"	
    fi;
}

#
# nagsite - keep calling checksite until the
#           site is back online
#    args - a site to check
#         - number of seconds to sleep between
#           checks
#    rets - nothing
#
function nagsite(){

    while [[ $RET_VAL != 0 ]]; do
	checksite $1;
	sleep $2
    done
    
}

# usage: nagsite.sh google.com 60
# the above checks google.com every 60 seconds)
nagsite $1 $2