Linux

48372 readers

1868 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

[email protected]

Script to check external ip and send to mail (self.linux)

submitted 1 year ago* (last edited 1 year ago) by murkom to c/[email protected]

11 comments fedilink hide all child comments

Maybe it's useful for somebody.
Checks ip and sends to your email., if it has changed. Save as ipcheck.sh and put on /home/USER/
To check every hour, execute crontab -e and add this to the end:

0 * * * * sh ipcheck.sh

Here it goes:

#!/bin/sh

#########################
## uncomment and edit as needed
#########################
#mail_to="[email protected]"
#mail_from="[email protected]"
#user="[email protected]"
#pass="password123"
#host_params="--host=smtp.sapo.pt --port=587 --tls=on --tls-starttls=on --auth=on"

#########################
## do not edit lines bellow
#########################
ip_old=""
ip_new=""
if [ -f ip.txt ]; then ip_old="$(cat ip.txt)";  fi
ip_new="$(curl --connect-timeout 10 --max-time 10 --retry 3 --retry-delay 0 -s icanhazip.com)"

if [ "$ip_new" != "" ] && [ "$ip_new" != "$ip_old" ]
then
echo $ip_new > ip.txt
printf "To:$mail_to\nSubject: IP\n\nOld ip = $ip_old\nNew ip = $ip_new" | msmtp --timeout=10 -t --from=$mail_from --user=$user --passwordeval="echo '$pass'" $host_params
fi

you are viewing a single comment's thread
view the rest of the comments

[–] rambos 1 points 1 year ago (1 children)

Thx, this is interesting. Im using duckdns atm, but would be nice to replace it with some local scrip if possible

[–] murkom 1 points 1 year ago

I also use duckdns.
But as i like doing little scripts and wanted to try this, i remembered to share here.