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Full Discussion: how to get what date was 28 days ago of the current system date IN UNIX
Top Forums Shell Programming and Scripting how to get what date was 28 days ago of the current system date IN UNIX Post 302405218 by panyam on Thursday 18th of March 2010 07:13:25 AM
Old 03-18-2010
Hi thillai_selvan,

I suspect the command you have given might be OS dependent (the format you suggested available under GNU and it's part of sh-utils package) as it does not work in my case too.

Code:
 
avalon:/disk1/jvsh/TEST/TES>date
Thu Mar 18 16:39:47 IST 2010
avalon:/disk1/jvsh/TEST/TES>date +%Y-%m-%d --date='28 day ago'
2010-03-18

Reddy,

have a look here : https://www.unix.com/shell-programmin...ipulation.html

and something also like this you can use :

Code:
perl -le 'print scalar localtime (time() - 86400 * 28);'

Last edited by panyam; 03-18-2010 at 08:18 AM..
 

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LEARN ABOUT DEBIAN

lchage

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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