Re: bash date math

[Goncalo <goncalo mail eunet pt>]

> > In a bash script, I need to know the previous day.
> >
> > if 03012003 then 02282003
> > if 05012003 then 04302003
> > if 08012003 then 07312003
> >
> > using date, I can get todays date.  But I need date math.
>
> $ date -d "-1 day"
> Wed Jul 30 10:48:46 EDT 2003
>
or
  $ date -d yesterday
or
  $ date -d "1 day ago"

Gonçalo