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Date:      Sun, 6 Feb 2011 23:16:10 +0100
From:      J65nko <>
To:        kellyremo <>
Cc:        FreeBSD <>
Subject:   Re: if the file changes send email about diff
Message-ID:  <>
In-Reply-To: <>
References:  <>

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On Sun, Feb 6, 2011 at 2:33 PM, kellyremo <> wrote:
> I have 2 script. Script "A", Script "B".
> Script "A" is regulary watching the "dhcpacks" [dhcp release is configure=
d to 2mins] in the logs, for the past 2 minutes. it writes the MAC addresse=
s to a file [/dev/shm/dhcpacks-in-last-2min.txt] every 2 minutes. Ok, this =
is working, active clients are in this file. Super!
> Script "B":
> I'm trying to create a script, that watches the changes in "/dev/shm/dhcp=
acks-in-last-2min.txt" file [in every 1 sec]. Ok. But: my "watcher" script =
[the pastebined] is not working fine...sometime it works, sometime it send =
that someone "XY logged out", but it's not true! nothing happened, and the =
problem is not in the Script "A".
> Can someone help me point out, what am i missing? How can i watch a file =
[in every sec], that contains only MAC addresses, and if someone doesn't ge=
t dhcpack in 2 minutes, the file "/dev/shm/dhcpacks-in-last-2min.txt" chang=
es, and that clients MAC address will be gone from it, and i need to know, =
who was it [pastebined my script..but somethings wrong with it].

You are attempting to re-invent the wheel called "revision control
system" ;) Your FreeBSD box has a simple revision control system
called 'rcs'. It will do the most things you are trying to emulate in
your shell script.

Read the rcsintro(1) man page how to get started.

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