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Top Forums Shell Programming and Scripting Newline in my script-built shell variable Post 302527521 by micantox on Friday 3rd of June 2011 12:58:07 PM
Old 06-03-2011
Newline in my script-built shell variable

Hi all,

I'm not exactly a shell script guru, so this is probably a very silly question and I'm not seeing the point, but you know, sometimes it happens...

I have this script which adds entries to local arp cache using it to find the corresponding IP address.

Code:
# export MAC=00:25:90:34:3d:f2
# export IP=$(fping -c1 -g -q `ifconfig eth0 | grep "inet addr" | awk -F : {'print $2'} | awk {'print $1'} | awk -F . {'print $1"."$2"."$3".0/24"'}` &>/dev/null; echo  && arp -n | grep $MAC | awk {'print $1'})

The problem is that in every macro I use from now on, the variable $IP inserts a newline before being printed or used.

Code:
# echo "IP is $IP"
> IP is
> 192.168.26.59

I cannot use this variable inside a more complex command because of this newline.

Why is this happening and how to solve it?

I thank you all in advance.

Bye,
M.

Last edited by pludi; 06-03-2011 at 02:27 PM..
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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