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From: Riccardo on 25 May 2010 03:04
I'm using shell script which help me to keep a copy of my mailbox for
last N days (e.g. 40 days), so I need unique total file which will
contain msg about last 40 days.
I'm going to schedule a crontab task which will start every day at the
same time.

How can I create script file, where every time script starts (every
day), I have to replace from total file the part which contains data
about the 40th day with that one which contains latest data ?
Do you know if it exist shell commands to work with SUBTRACTION among
files ?
From: Grant on 25 May 2010 03:41
On Tue, 25 May 2010 00:04:07 -0700 (PDT), Riccardo <ric.castellani(a)alice.it> wrote:

>I'm using shell script which help me to keep a copy of my mailbox for
>last N days (e.g. 40 days), so I need unique total file which will
>contain msg about last 40 days.
>I'm going to schedule a crontab task which will start every day at the
>same time.
>
>How can I create script file, where every time script starts (every
>day), I have to replace from total file the part which contains data
>about the 40th day with that one which contains latest data ?
>Do you know if it exist shell commands to work with SUBTRACTION among
>files ?

Think of it more in terms of adding the to head of the file, then
chopping off a piece of the tail?

So you could write today's to a new temp file, append first 39 days
from total (now 2nd to 40th day) to the temp, rename (mv) temp to total.

Grant.
--
http://bugs.id.au/
From: Riccardo on 25 May 2010 04:57
On 25 Mag, 09:41, Grant <o...(a)grrr.id.au> wrote:
> On Tue, 25 May 2010 00:04:07 -0700 (PDT), Riccardo <ric.castell...(a)alice.it> wrote:
> >I'm using shell script which help me to keep a copy of my mailbox  for
> >last N days (e.g. 40 days), so I need unique total file which will
> >contain msg about last 40 days.
> >I'm going to schedule a crontab task which will start every day at the
> >same time.
>
> >How can I create script file, where every time script starts (every
> >day), I have to replace from total file the part which contains data
> >about the 40th day with that one which contains latest data ?
> >Do you know if it exist shell commands to work with SUBTRACTION among
> >files ?
>
> Think of it more in terms of adding the to head of the file, then
> chopping off a piece of the tail?
>
> So you could write today's to a new temp file, append first 39 days
> from total (now 2nd to 40th day) to the temp, rename (mv) temp to total.
>
> Grant.
> --http://bugs.id.au/

Well, that's a good idea but how can I detect 39 days (2nd to 40th)
into total file ?
My mailbox is always feed from messages , so every day I can copy this
mailbox to temp file (today) and then I can erase it for populating
again.
I can accumulate msg into total file, appending every day "temp file"
to "total file", but I cannot distinguish msg for data because cron
start at specific time
From: Bit Twister on 25 May 2010 06:42
On Tue, 25 May 2010 01:57:28 -0700 (PDT), Riccardo wrote:
>
> Well, that's a good idea but how can I detect 39 days (2nd to 40th)
> into total file ?

Store day counter in a file. Use it for decisions.

_counter_fn=/some/where/day.counter

if [ ! -e $_counter_fn ] ; then
echo "day=0" > $_counter_fn
fi

.. $_counter_fn
let day="day + 1"
echo "day=$day" > $_counter_fn

#*********************
#* daily goes code here
#*********************


if [ $day -lt 40 ] ; then
exit 0
fi

echo "day=0" > $_counter_fn

#*************************
#* day 40 code goes here
#*************************



> I can accumulate msg into total file, appending every day "temp file"
> to "total file", but I cannot distinguish msg for data because cron
> start at specific time

Well, at day 40 add in whatever you like. Example:

echo "
#*************
#* $(date)
#*************
" >> $_total_fn
From: Matt Giwer on 25 May 2010 20:06
On 05/25/2010 03:04 AM, Riccardo wrote:
> I'm using shell script which help me to keep a copy of my mailbox for
> last N days (e.g. 40 days), so I need unique total file which will
> contain msg about last 40 days.
> I'm going to schedule a crontab task which will start every day at the
> same time.
> How can I create script file, where every time script starts (every
> day), I have to replace from total file the part which contains data
> about the 40th day with that one which contains latest data ?
> Do you know if it exist shell commands to work with SUBTRACTION among
> files ?

What mail program are you using? It is generally only two files, one that
contains the messages and the other an index to it. Why not set the software
for a 40 day retention policy and then simply copy those two files? No use
making work for yourself.

--
All squattertowns beyond the Green Line are considered by the world to be
criminal. Why are not those who live in them arrested as criminals?
-- The Iron Webmaster, 4253
http://www.giwersworld.org/israel/is-seg.phtml a14
Tue May 25 20:00:43 EDT 2010
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