I have a new website and I want to know the number of new signup every day, so I wrote a small script
new_users.sh that will print the number of new signups today.
$ new_users.sh 280
I ran this script daily using a cron job and add it to user.dat file:
0 0 * * * /home/rayed/bin/new_users.sh >> /home/rayed/var/user.dat
After few days the file will look like this:
#Users 50 104 202 298 290 289 291 310 311 280
I could send this file daily and read, but it wouldn’t give a good picture of how new user signup is changing by time, so the next logical step is to convert it to a graph for easier understanding.
I used gnuplot to convert the textual data to a graph, and automatically email it to me.
So I wrote the following small script, email_graph.sh:
#!/bin/sh PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" from_email="email@example.com" to_email="firstname.lastname@example.org" plot=" set terminal png \ medium \ size 800,400; plot 'user.dat' with lines; " img_base64=`echo $plot | gnuplot | base64` sendmail $to_email <<EOF From: <$from_email> To: <$to_email> Subject: Plot and Inline image from CLI Mime-Version: 1.0 Content-Type: multipart/related; boundary="boundary-example"; type="text/html" --boundary-example Content-Type: text/html; charset="US-ASCII" This email sent from Linux CLI: <br> <IMG SRC="cid:plot_image_1" ALT="Plot"> --boundary-example Content-ID: <plot_image_1> Content-Type: IMAGE/PNG Content-Transfer-Encoding: BASE64 $img_base64 --boundary-example-- EOF
When you run it you will receive the following graph on your email:
Of course you can edit the email HTML template, add new graph, or do whatever you like to customise it.
I hope you find it useful.
Side note to self:
To install gnuplot with X11 support on OSX:
brew install gnuplot --with-x