The UNIX and Linux Forums

VCS heartbeat

incredible — Sun, 05 Jul 2009 01:15:59 GMT

we have a vcs cluster set up and noticed that they were showing one of the heart beat link qfe3 as DOWN. Both qfe2 and qfe3 were fine all along, btw if I were to push in/re-set the hb cable, do you know whether it will panic or cause anything to the system,? Its a DB critical prod nodes

RedHat Linux Automatic Updates

s_linux — Sun, 05 Jul 2009 00:18:36 GMT

Hi All,

we have about 50 RedHat Linux servers (v4.x, 5.x), now we planing to configure those servers to get updates(service packs, security patches...etc) automatically. whats is the best practises to do this.

we also have SLES servers and we use Novell's SMT tool to get updates, we configured one server as central repositary to connect to novell site to get updates. then client servers connet to central repositary to get updates. That way all servers get updated.

we are looking that kind of method to update redhat servers. Any one please advice. Thanks.

using awk to comment out lines to the end of file

phamp008 — Sat, 04 Jul 2009 21:32:50 GMT

Hello,

I have a file as follow

a
b
c
c
d
d
e

I would like to write a awk command to insert # from the first occurence of
"c" to the end of the files.
OUTPUT should be like this

a
b
#c
#c
#d
#d
#e

I kept getting error while attempting to use break

awk ' if ( $1 ~ /^c/ ) { beginline = NR ; break } '

Greatly appreciate your comment

Top command in AIX 4.2 (no topas, no nmon, no top)?

Browser_ice — Sat, 04 Jul 2009 21:17:03 GMT

Is there a 'top' command equivalent in AIX 4.2 ?

I already checked and I do not see the following ones anywhere:
top
nmon
topas

Tempest

iBot — Sat, 04 Jul 2009 18:15:07 GMT

There are lots of myths about TEMPEST and emanations (or emissions) security. This site provides detailed information. Unfortunately, it isn't quite as sensational as the myths, but more useful.

More...

runtime crontab entry

mrpranab — Sat, 04 Jul 2009 17:59:50 GMT

Hi,

I have a query. When I execute a shell script say sh1.ksh,
at the run time I need to put another shell script say sh2.ksh
in the crontab with the parameter which we provided to sh1.ksh
script, to execute sh2.ksh on the background for doing process.

Also the cron entry needs to be removed after the script
finishes its jobs.

How do we put a file in the crontab with parameter and remove
the entry from crontab dynamically?

Ex: - ./sh1.ksh

In crontab the script should look like this:
5 * * * * sh2.ksh

Thanks in adv.

Worm_waledac.du

iBot — Sat, 04 Jul 2009 17:00:05 GMT

Malware: WORM_WALEDAC.DU

More...

finger command

xstation — Sat, 04 Jul 2009 16:01:44 GMT

I want to know the correct version of how i should use the finger command in this example below.(os is debian lenny)

(nymserver.pl is located in /home/nymserv directory.)

the two versions are :

(in/etc/inetd.conf)
finger stream tcp nowait nymuser /usr/nym/nymserv nymserv -fingerd

----and
(in rc local script)
finger stream tcp nowait root /usr/sbin/tcpd /home/nymuser nymuser /usr/nym/nymserv -fingerd

thanks

xstation
ps i have tried
finger stream tcp nowait nymuser /usr/nym/nymserv nymserv -fingerd
and
finger stream tcp nowait nymuser /usr/nym/nymserv nymserver.pl -fingerd

but get connection refused

help me out in letting me know the meaning of sh, ksh, bash

jojo123 — Sat, 04 Jul 2009 15:26:50 GMT

Could you please help me out in letting me know the meaning of

Code:

#!/bin/sh

#!/bin/ksh

#!/bin/bash

what the difference between all these :eek:....

Also please view the below mention script, could you please explain whats this script doing

Code:

#!/bin/bash

t=100

echo $t

echo $tea

echo ${t}ea

Thnkz in advance.

How to find 'Day of week' in Linux system

rajinavaneethan — Sat, 04 Jul 2009 13:42:07 GMT

Hi All,

I want to find a day of week for the Linux system.

can some one help me on this..

Thanks in advance,
Raji.

CEP Thinking: A Dream, Wishful Thinking or Incompetance?

iBot — Sat, 04 Jul 2009 12:00:01 GMT

Tim Bass
07-04-2009 07:40 AM

Source...

Detect USB keyboard and other peripherals

chebarbudo — Sat, 04 Jul 2009 10:37:12 GMT

Hi there,

I have a Debian machine without any peripherals (no screen, no keyboard, etc.). I'd like to be able to detect and log when someone plugs a USB keyboard. Something like : 2009-07-04 12:21 warning: keyboard pluged!
Is that possible?

I see two ways :
1. Either actively react to the connection of a device and execute a script that logs the alert.
2. Or cron a script that checks for USB devices every 5 minutes.
I have no idea how to do either ways.
Can anyone help me on that?

I would be glad to just be able to alert when any USB device is plugged. No matter if it's a keyboard or a flash key. But if I can make the difference between each device type... Better!

Thanks for your help
Santiago

Making Large Connection nodes for Graph

anjas — Sat, 04 Jul 2009 09:30:00 GMT

Hi power user,

Basically, this thread is a continuation of the previous one :):

http://www.unix.com/shell-programmin...#post302326483

However, I'm going to explain it again.

I have this following data:

file1
aa A
aa B
aa C
bb X
bb Y
bb Z
cc O
cc P
cc Q
. .
. .
. .
. .

and I want to turn them into a connection nodes like this:
file2

A aa A
A aa B
A aa C
B aa C
B aa B
C aa C
X bb X
X bb Y
X bb Z
Y bb Z
Y bb Y
Z bb Z
. . .
. . .
. . .
. . .

I made this relation, to create a graph. The file have more than 6.000.000 lines.
For smaller files (100.000 lines), I have used this following script in the previous thread:

join -o 1.2 0 2.2 -1 1 -2 1 file1 file1 | nawk '!a[$3$2$1];{a[$1$2$3]++}'
join -o 1.2 0 2.2 -1 1 -2 1 file1 file1 | nawk '$1<$3{print;next}{print$3,$2,$1}' | sort -u
nawk '
NR==FNR { c = a[$1]; a[$1] = c?c" "$2:$2; next }
{ c = a[$1]
if (c) {
split(c,b)
for (k in b) {
p = $2 if (!d[p]++) print p
}
}
}
' file1 file1
For small file, those three kind of scripts could create the network only in less than 10 minutes. However, for files with more than 6.000.000 lines, even after one days, there was no results at all :confused:. Is there any faster way to do it?

Any suggestion, how to create file2 by using perl or awk? Tx

Check free space in SVM

fugitive — Sat, 04 Jul 2009 06:59:53 GMT

how can we check the free space in SVM for a LUN .. I 've a 300G LUN and created several soft partitions on it but now i want to know how much i can grow .. i.e how much space is left on this 300G LUN

is open source more secure ?

zxmaus — Sat, 04 Jul 2009 06:30:25 GMT

Hi Guys,

I'd like to know your opinion. A friend of mine claims, an open source OS like linux is more secure than a closed one like AIX because 'if he is hacked, he can do countermeasures'.

I believe the opposite is the case - it's more secure if not everybody knows the kernel and is able to manipulate it.

What do you think? - and why

Kind regards
zxmaus