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Full Discussion: date -1
Top Forums Shell Programming and Scripting date -1 Post 302667561 by spynappels on Friday 6th of July 2012 12:12:34 PM
Old 07-06-2012
How about a variation of the following?

Code:
var=$(date --date=20120305 +%s)

var=$(($var-86400))

date -d @$var +%Y%m%d

Substitute the first date with a variable from elsewhere in the script and voila.
This User Gave Thanks to spynappels For This Post:
Irishboy24
 

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LEARN ABOUT LINUX

pam_lastlog

PAM_LASTLOG(8)							 Linux-PAM Manual						    PAM_LASTLOG(8)

NAME

       pam_lastlog - PAM module to display date of last login

SYNOPSIS

       pam_lastlog.so [debug] [silent] [never] [nodate] [nohost] [noterm] [nowtmp] [noupdate] [showfailed]

DESCRIPTION

       pam_lastlog is a PAM module to display a line of information about the last login of the user. In addition, the module maintains the
       /var/log/lastlog file.

       Some applications may perform this function themselves. In such cases, this module is not necessary.

OPTIONS

       debug
	   Print debug information.

       silent
	   Don't inform the user about any previous login, just update the /var/log/lastlog file.

       never
	   If the /var/log/lastlog file does not contain any old entries for the user, indicate that the user has never previously logged in with
	   a welcome message.

       nodate
	   Don't display the date of the last login.

       noterm
	   Don't display the terminal name on which the last login was attempted.

       nohost
	   Don't indicate from which host the last login was attempted.

       nowtmp
	   Don't update the wtmp entry.

       noupdate
	   Don't update any file.

       showfailed
	   Display number of failed login attempts and the date of the last failed attempt from btmp. The date is not displayed when nodate is
	   specified.

MODULE TYPES PROVIDED

       Only the session module type is provided.

RETURN VALUES

       PAM_SUCCESS
	   Everything was successful.

       PAM_SERVICE_ERR
	   Internal service module error.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       Add the following line to /etc/pam.d/login to display the last login time of an user:

	       session	required  pam_lastlog.so nowtmp

FILES

       /var/log/lastlog
	   Lastlog logging file

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_lastlog was written by Andrew G. Morgan <morgan@kernel.org>.

Linux-PAM Manual						    06/04/2011							    PAM_LASTLOG(8)
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