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Full Discussion: two while nested loops
Top Forums Shell Programming and Scripting two while nested loops Post 302690975 by Chubler_XL on Thursday 23rd of August 2012 04:47:10 PM
Old 08-23-2012
Why not just use nmap? It's the right tool for this sort of task.

Anyway, after having a quick look at your script, I came up with:

Logic: Try and change things around so you have multiple nc commands running at once (in the background). After all, the majority of the runtime for a task like this is spent wating for the reply packets.

Instead of date | awk '{print $2" "$3" "$4" "$6}', you can use date "+%d %b, %Y %T"

On this command:
Code:
ANSWER=$(nc -v ${server} ${portnumber} -w 2 | tr -d '\015\032' 2>/dev/null)

tr is pretty unlikley to produce any output on stderr, you probably want:
Code:
ANSWER=$(nc -v ${server} ${portnumber} -w 2 2> /dev/null | tr -d '\015\032')

 

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LEARN ABOUT DEBIAN

jetpipe

jetpipe(8)																jetpipe(8)

NAME

       jetpipe - bind a printer device to a tcp port

SYNOPSIS

       jetpipe <printerdevice> <portnumber>

DESCRIPTION

       jetpipe	will  bind  a  printer	device	to  a given portnumber so the printer can be accessed through the JetDirect protocol from a remote
       client.

EXAMPLE

       /usr/sbin/jetpipe /dev/usblp0 9100

       The above commandline will bind the USB printer on /dev/usblp0 to port 9100 where it can be acessed through the JetDirect protocol  from  a
       cups client

SEE ALSO

       cups-deviced(8), cups-driverd(8), cups-lpd(8), cups-polld(8), cupsd.conf(5) cupsd(8)

AVAILABILITY

       jetpipe	is part of ltsp package and the latest versions are available in source form from https://launchpad.net/products/ltsp (link to URL
       https://launchpad.net/products/ltsp) .

AUTHOR

       copyright 2006 Oliver Grawert <ogra@ubuntu.com>, distributed under the terms of the GNU General Public License version 2 or any later  ver-
       sion.

Oliver Grawert							     20061206								jetpipe(8)
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