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Top Forums Shell Programming and Scripting Date One Week Ago From Given Date, Not From Current Date Post 302470292 by Lakris on Tuesday 9th of November 2010 04:50:00 PM
Old 11-09-2010
Hi,
another way is to use the fantastic date command, if perl isn't a requirement, and sh is ok.
Example:
Code:
date +%Y-%m-%d -d "2008-01-03 -7 days"

or in Your case,
Code:
back_time=$(date +%Y-%m-%d -d "2010-07-23 -7 days")

or with variable start date
Code:
start_date=2010-07-23
back_time=$(date +%Y-%m-%d -d "$start_date -7 days")

lots of options and very pedagogic!
Smilie

Best regards,
Lakris

Last edited by Lakris; 11-09-2010 at 05:52 PM.. Reason: added example
 

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lchage(1)						      General Commands Manual							 lchage(1)

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. Set days to -1 to disable password expiration (i.e. to ignore --mindays, and --maxdays and related settings). Set days to 0 to enforce password change on next login. (This also disables password expiration until the password is changed.) -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 is required to change the password). Set days to -1 to keep the account enabled indefinitely after password expiration. -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 or -1 to disable this requirement. If this value is larger than the value set by --maxdays, the user cannot change the pasword. -M, --maxdays=days Require changing the password after days since last password change. Set days to -1 to disable password expiration. -W, --warndays=days Start warning the user days before password expires (before the user is required to change the password). Set days to 0 or -1 to disable the warning. EXIT STATUS
The exit status is 0 on success, nonzero on error. NOTES
Note that "account expiration" (set by --expire) is distinct from "password expiration" (set by --maxdays). Account expiration happens on a fixed date regardless of password changes. Password expiration is relative to the date of last password change. libuser Nov 8 2012 lchage(1)
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