Bash script domain expiration date with email sending

Question

Below is my code implementation:

#!/bin/bash

DOM="onet.pl wp.pl"

for d in $DOM

do

  echo -n "$d - "

  whois $d | egrep -i 'Expiration|Expires on' | head -1

   whois $d | egrep -i 'Expiration|Expires on' | head -1 >> /tmp/domain.date

  echo ""

done

#[ -f /tmp/domain.date ] && mail -s 'Domain renew / expiration date' [email protected] < /tmp/domain.date || :

This code sends automatic mail when the domain expires. I’ve managed to code to show the expiration date and to send an email with an output. Can anyone tell me how to compare the expiration date with the current data which gives the result as a number of days? 

Answer 1

You just need to add the date command “date -d” to parse the date:

# Get the expiration date

expdate="$(whois $d | egrep -i 'Expiration|Expires on' | head -1)"

# Turn it into seconds (easier to compute with)

expdate="$(date -d"$expdate" +%s)"

# Get the current date in seconds

curdate="$(date +%s)"

# Print the difference in daysprintf "Number of days to expiration : %s\n" "$(((expdate-curdate)/86400))"

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