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Top Forums Shell Programming and Scripting Get a given date and subtract it to 5 days ago Post 303012997 by nms on Tuesday 13th of February 2018 01:55:28 PM
Old 02-13-2018
Get a given date and subtract it to 5 days ago

Hi all,

I have been researching to obtain SSL certification expiry for most of our webistes. For some cases, some hosts where not directly accessible so i finally got a solution working with curl using my proxy. This lists the expiry date which i'm finally looking for.

Code:
[matt@server]# curl --proxy http://x.x.x.x:xxxx --insecure -v https://matt.com/ 2>&1 | awk 'BEGIN { cert=0 } /^\* SSL connection/ { cert=1 } /^\*/ { if (cert) print }' | grep "expire date"
*       expire date: Feb 13 23:59:59 2019 GMT

The next step is to try to find a way to get notified 5 days before that date (no emails).

First thoughts are to extract the date using awk/sed from the above result and convert it to epoch:

Code:
 date --date="13-Feb-19" +%s
1550012400

Then i was thinking to somehow subtract this date to 5 days ago and convert it to epoch time. With both values in hand i subtract and the difference will be the said threshold. if less then, it means less then 5 days prior to expiry.
However i don't see how we can get a GIVEN date and subtract.
Do you have some thoughts or maybe other ideas?

Rgds,

Matthew
 

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lchage(8)						      System Manager's Manual							 lchage(8)

NAME
lchage - Display or change user password policy SYNOPSIS
lchage [OPTION]... user DESCRIPTION
Displays or allows changing password policy of user. OPTIONS
-d, --date=days Set the date of last password change to days after Jan 1 1970. -E, --expire=days Set the account expiration date to days after Jan 1 1970. Set days to -1 to disable account expiration. -i, --interactive Ask all questions when connecting to the user database, even if default answers are set up in libuser configuration. -I, --inactive=days Disable the account after days after password expires (after the user user is required to change the password). -l, --list Only list current user's policy and make no changes. -m, --mindays=days Require at least days days between password changes. Set days to 0 to disable this checking. -M, --maxdays=days Require changing the password after days since last password change. Set days to 99999 to disable this checking. -W, --warndays=days Start warning the user days before password expires (before the user is required to change the password). EXIT STATUS
The exit status is 0 on success, nonzero on error. libuser Jan 12 2005 lchage(8)
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