Bash script that runs a command when a website is done

website-down.sh

#!/bin/bash
set -e

#
# Script variables
# 

# The url to check
WEBPAGE="https://www.bsimard.com/"
# Timeout
MAX_TIME=5
# Command to exec when site is down
COMMAND="sudo systemctrl nginx restart"


# Check if the script is already running
# If the command takes a long time, we don't want to execute it again
FILENAME=$(basename $0)
for pid in $(pidof -x ${FILENAME}); do
    if [ $pid != $$ ]; then
        echo "[$(date)] : Process is already running with PID $pid"
        exit 1
    fi
done

# Do a call to the url, and if its response is not a 200 execute the script
HTTPCODE=$(curl --fail --max-time ${MAX_TIME} --silent --write-out %{response_code} --output /dev/null "$WEBPAGE" | head -n 1)
if [[ $HTTPCODE -ne 200 ]]; then
    echo "[$(date)] : Website ${WEBPAGE} is down, executing ${COMMAND}"
    eval "${COMMAND}"
fi

exit 0