Need Help in Creating Diskspace Script

Question

I need help in creating a script that will run once a day in afternoon and collect the information of each partition(Disk Space , Total and Used) and send it to my email.

Please help im very very new in this scripting thing.

Answer 1

Provided you have an MTA configured on that machine to accept and relay mail for you (on a server that should be the case) try this:

$ df -h | mail -s "Filesystem usage report for `hostname`" myemail@domain.tld

(MTA = Postfix, Exim, etc.)

If that fits your needs, add it to your crontab to run every day:

$ crontab -e

An editor will open. Add a line like this:

@daily df -h | mail -s ...

Save and close.

This will make it run with the other daily tasks. If you need a report on a specific time of the day or error logging to a specific address, please read about the cron syntax (a lot of this is on the Internet - here's one random website). For example:

MAILTO=myerroraddress@domain.tld
# at 5 a.m every day:
0 5 * * * mycommand

In case you can't send out mail on that machine directly, read this or the answer by @hakermania on how to do that (many more ways exist).

Answer 2

In order to make the script running you will need to setup a cron job with it: How do I setup a cronjob ?

Now, inside your script, you will need to do something like this:

#!/bin/bash
#script that simply saves the output of df -h to an output file
#which is sent as an attachment to an e-mail

#a) save the output of the command:
temp_file=$(mktemp)

df -h > $temp_file 2> /dev/null

/root/email.py recipient@gmail.com "Title here" "Body here. The current date and time is $(date)" "$temp_file"

sleep 3
rm -rf $temp_file

As you can see, I'm calling a python script from within your root path (not readable but nobody else but root himself) which takes the following arguments:

"recipient-email" "title-of-email" "body-of-email" "attachment"

This python script is this:

#!/usr/bin/python
import os, re
import sys
import smtplib

from email import encoders
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.MIMEText import MIMEText


SMTP_SERVER = 'smtp.gmail.com'
SMTP_PORT = 587


sender = 'youremailhere@gmail.com'
password = "yourpasswordhere"
recipient = sys.argv[1]
subject = ''
message = sys.argv[3]

def main():
    msg = MIMEMultipart()
    msg['Subject'] = sys.argv[2]
    msg['To'] = recipient
    msg['From'] = sender

    part = MIMEText('text', "plain")
    part.set_payload(message)
    msg.attach(part)

    session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)

    session.ehlo()
    session.starttls()
    session.ehlo

    session.login(sender, password)

    fp = open(sys.argv[4], 'rb')
    msgq = MIMEBase('audio', 'audio')
    msgq.set_payload(fp.read())
    fp.close()
    # Encode the payload using Base64
    filename=sys.argv[4]
    msgq.add_header('Content-Disposition', 'attachment', filename=filename)
    msg.attach(msgq)
    # Now send or store the message
    qwertyuiop = msg.as_string()



    session.sendmail(sender, recipient, qwertyuiop)

    session.quit()
    os.system('notify-send "Your disk space related email has been sent."')

if __name__ == '__main__':
    main()

Of course you will need to provide it with your gmail email and password at the top of the script (sender and password variables). If you install the libnotify-bin package, then, if the email was successfully sent, you will be notified with a desktop notification.

So, summing up, you will need to setup a cron job with the above bash script. This bash script will save the output of df -h inside a temporary file, which will be sent via a python script to a recipient email of your choice (as far as I remember, the sender email must be gmail).

PS: The above solution will show the free and total disk space only of your mounted filesystems. If this is a problem please inform me so as to extend my answer about how to automatically mount all the available filesystems and then run df -h.

Answer 3

You can use this script to check the disk usage

#!/bin/bash

limit=85
email=you@domain.com
host=`hostname`
out=`df -k | grep "^/dev" | awk '{ if($5 > $limit) print "\nDisk space is critial on " $1,$5,$6 "\n"}'`
usr/bin/mail -s "Disk Space Alert on $host: $out" $email

Use cron to make the script run automatically. Check this online cron generator for helping you in setting it up.