Linux utility scripts.

diskspace-low-warning.sh

#!/bin/bash
#######################################################################################
# Script Name    : alertstorage.sh
# Description    : Send alert mail when server storage is running low.
# Args           :
# Author         : Liam Mitchell
# License        : MIT
#######################################################################################
subject="Server Storage Alert - ServerName"
from="cron@somesite.co.nz"
to="myemail@work.co.nz"

# Get total storage %.
CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')
THRESHOLD=90

# Check if storage is greater than the threshold precentage.
if [ "$CURRENT" -gt "$THRESHOLD" ] ; then
        # Send email if system storage is running low.
        echo -e "Warning, server storage is running low!" | mailx -s "$subject" -r "$from" "$to" "anotheremail@work.co.nz"
fi

exit 0

Send email using sendgrid example.sh

#!/bin/bash
SENDGRID_API_KEY="SG.YOUR_SENDGRID_API_KEY_HERE"
EMAIL_TO="someemail@work.co.nz"
FROM_EMAIL="SomeServer@work.co.nz"
FROM_NAME="SomeServer"
SUBJECT="Low Disk Space Email"

bodyHTML="<p>Testing sending email using sendgrid from sh.</p>"

maildata='{"personalizations": [{"to": [{"email": "'${EMAIL_TO}'"}]}],"cc":[{"email": "someccemail@work.co.nz"}],"from": {"email": "'${FROM_EMAIL}'",
        "name": "'${FROM_NAME}'"},"subject": "'${SUBJECT}'","content": [{"type": "text/html", "value": "'${bodyHTML}'"}]}'

curl --request POST \
  --url https://api.sendgrid.com/v3/mail/send \
  --header 'Authorization: Bearer '$SENDGRID_API_KEY \
  --header 'Content-Type: application/json' \
  --data "'$maildata'"