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Full Discussion: Help with a For loop and variables
Top Forums Shell Programming and Scripting Help with a For loop and variables Post 302570561 by Corona688 on Thursday 3rd of November 2011 03:18:26 PM
Old 11-03-2011
That's a dangerous use of backticks and useless use of cat. A 'while read' loop will be safer and faster.

You also don't need to reopen the same file 9000 times when processing 9000 IP addresses -- you can redirect the input and output of entire code blocks once instead of things inside them over and over.

Yes, store the result in a variable then print them both.

Code:
while read IP
do
        COUNTRY=$(whois "$IP" | grep -i "country:")
        echo "$IP: $COUNTRY"
done < ip.txt > out.txt

This User Gave Thanks to Corona688 For This Post:
molnir
 

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LEARN ABOUT NETBSD

urlphy

URL(4)							   BSD Kernel Interfaces Manual 						    URL(4)

NAME

     url -- Realtek RTL8150L USB Ethernet driver

SYNOPSIS

     url*    at uhub?
     urlphy* at mii?

DESCRIPTION

     The url driver provides support for USB Ethernet adapters based on the Realtek RTL8150L USB-ether bridge chip.

     The url driver supports the following adapters:

	   CompUSA USBKR100
	   GreenHouse GH-USB100B
	   Melco Inc. LUA-KTX
	   Sitecom LN013

     For more information on configuring this device, see ifconfig(8).

DIAGNOSTICS

     url%d: watchdog timeout  A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the
     transmission before a timeout expired.

     url%d: no memory for rx list  The driver failed to allocate an mbuf for the receiver ring.

SEE ALSO

     arp(4), mii(4), netintro(4), usb(4), ifconfig(8)

HISTORY

     The url device driver first appeared in NetBSD 1.6.

AUTHORS

     The url driver was written by Shingo WATANABE <nabe@nabechan.org>.

BSD
								September 18, 2006							       BSD
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