subtraction files
in [Shell]
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From: Riccardo on 25 May 2010 02:30 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: Janis Papanagnou on 25 May 2010 03:43 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 ? (I have a faint idea what your question is aiming at but can't decode your request sufficiently to give an accurate answer. You may want to provide more information.) > Do you know if it exist shell commands to work with SUBTRACTION among > files ? I assume here you're asking for a command like diff(1) or comm(1); see the respective man pages for details. Janis
From: Ed Morton on 25 May 2010 05:16 On 5/25/2010 1:30 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 ? Take a look at procmail, http://www.procmail.org/. In particular http://lipas.uwasa.fi/~ts/info/proctips.html might be useful. Ed.
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