bash script help: how to find mm-dd-yy of seven days ago?

[Paul Guglielmino]

When using GNU date you can do something like this:

date -d +%m-+%d-+%y --date '7 days ago'

The date program will do the calculations for you. Hope that helps.

Paul


> i'm trying to write a simple script that will delete all files that are
> seven days old on a daily basis.
> 
> each time the script is run it will add one new file (format:
> 10-04-04.gz) to an ftp location. before the script adds a new file i
> want it to delete the file that was added 7 days ago. the point of all
> this is to have a history of at least 6 days at any given time.
> 
> at this point i have managed to get the current timestamp from date with
> 'date +%s'. i can also subtract seven days worth of seconds (604,800)
> from that timestamp. but what i don't know how to do is feed the new
> timestamp back into 'date' and have it return a date formatted like
> %m-%d-%y. i don't think 'date' even supports what i want to do, but i
> can't find a command that does.
> 
> any help would be appreciated.
> 
> 
> thanks,
> chris.
> 
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-- 
Paul Guglielmino <paulg at ccs.neu.edu>  --  http://www.ccs.neu.edu/home/paulg