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Top Forums Shell Programming and Scripting How to get date n months before in Unix? Post 302374619 by Franklin52 on Wednesday 25th of November 2009 05:05:05 AM
Old 11-25-2009
If you have GNU date you can do something like:

Code:
date -d "2 month ago" +%F

otherwise you can check one of the links of:

https://www.unix.com/answers-frequent...rithmetic.html
 

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PMDATE(1)						      General Commands Manual							 PMDATE(1)

NAME
pmdate - display an offset date SYNOPSIS
pmdate [ offset ... ] format DESCRIPTION
pmdate displays the current date and/or time, with an optional offset. An offset is specified with a leading sign (``+'' or ``-''), followed by an integer value, followed by one of the following ``scale'' spec- ifiers; S seconds M minutes H hours d days m months y years The output format follows the same rules as for date(1) and strftime(3). For example, the following will display the date a week ago as DDMMYYYY; pmdate -7d %d%m%Y PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura- tion file, as described in pcp.conf(5). SEE ALSO
date(1), strftime(3), pcp.conf(5) and pcp.env(5). Performance Co-Pilot PCP PMDATE(1)
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