Commands using mail

Replace "4158575309@txt.att.net" with your carrier's SMS gateway identifier. The one in the sample is for AT&T. More here https://en.wikipedia.org/wiki/List_of_SMS_gateways. Helpful for getting notifications about long running commands. ";" executes regardless of exit status of last command. && will only notify you if the command succeeds.

Every 20 minutes test if host with IP 192.168.0.14 is 'dead' or not reachable.

The line should be put in your crontab file.

This is a two part command that comes in really handy if you're running commands that take longer than you're willing to wait. The commands are separated by the semicolon(;) The first command is whatever you're attempting to do. The second commands emails you after the job completes.

Counts the number of new emails in the post office (or wherever mail is set up to check).

I created this so I could send myself an email alert when a long-running job was finished, e.g.,

Note, you need to replace the email address with your private Instapaper email address.

There are a bunch of possible improvements such as,

- Not writing a temp file

- Doesnt strip tags (tho Instapaper does thankfully)

- Shouldnt require 2 curls

This version uses netcat to check a particular service.

For some reason the 2&>1 does not work for me, but the shorter stdout/stderr redirection >& works perfectly (Ubuntu 10.04).

Checks if a web page has changed. Put it into cron to check periodically.

Change http://www.page.de/test.html and mail@mail.de for your needs.

A cronjob command line to email someone when a webpages homepage is updated.

It's very common to have cron jobs that send emails as their output, but the From: address is whatever account the cron job is running under, which is often not the address you want replies to go to. Here's a way to change the From: address right on the command line.

What's happening here is that the "--" separates the options to the mail client from options for the sendmail backend. So the -f and -F get passed through to sendmail and interpreted there. This works on even on a system where postfix is the active mailer - looks like postfix supports the same options.

I think it's possible to customize the From: address using mutt as a command line mailer also, but most servers don't have mutt preinstalled.

on this way we can define the body too

Alternative to the ping check if your firewall blocks ping. Uses curl to get the landing page silently, or fail with an error code. You can probably do this with wget as well.

Email if you disk is over 90% - www.fir3net.com

Joker wants an email if the Brand X server is down. Set a cron job for every 5 mins with this line and he gets an email when/if a ping takes longer than 3 seconds.

if "mail -a" fail, try "mutt -a" or "nail -a"

uuencode the file to appear as an attachment

This just reads in a local file and sends it via email. Works with text or binary. *Requires* local mail server.

Replace "user@domain.com" with the target e-mail address. Thanks to alediaz for "$HOSTNAME" which is very useful when running the command with Apple Remote Desktop to multiple machines simultaneously.

The uuencode utility will encode your file so that it can be sent as an attachment to an email. It is part of the sharutils package in RHEL/CentOS/Fedora.

An easy one but nice to keep in mind.

This is useful if you have need to do port forwarding and your router doesn't assign static IPs, you can add it to a script in a cron job that checks if you IP as recently changed or with a trigger script.

This was tested on Mac OSX.