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Full Discussion: Scripting issue
Top Forums Shell Programming and Scripting Scripting issue Post 303005334 by rbatte1 on Tuesday 17th of October 2017 07:13:25 AM
Old 10-17-2017
Welcome arun_adm

I think your so-called one-liner is not. It is multiple commands (one of them over-complex) joined on a single line, making it hard to read.

Here it is written more sensibly (with a few tweaks too):-
Code:
while read target_server
do
   echo "+++++++++ ${target_server} +++++++++"
   ssh -q ${target_server} 'paste \
         <(/sbin/ifconfig -a|egrep -i "eth|bond"|awk '{print $1}') \
         <(/sbin/ifconfig -a|egrep "inet addr"|grep -v "127.0.0.1"|awk '{print $2}'|cut -d ':' -f 2) \
         <(/sbin/ifconfig -a|egrep "inet addr"|grep -v "127.0.0.1"|awk '{print $2}'|cut -d ':' -f 2| \
            xargs -n1 nslookup | grep -v nameserver | cut -f 2 | grep name | cut -f 2 -d "=" | sed 's/ //')'
   echo "========================="
done < server-list.txt > output.txt

I have used a meaningful variable name rather than just i and read the file into a while loop. It is clearer to read and the input does not risk get eaten up by the commands within the loop.

The line ending \ can have nothing after it. It means that the new-line is ignored, so on execution it is joined up but means it is somewhat easier to read.

I would suggest you are trying to do too much in one step with pipes from the output to grep, then awk, then cut, then xargs, then cut, then cut, then grep, then cut and finally sed Smilie

A tool like awk can do all of this (although it might need to call out to nslookup) which will neaten your code too.


Can you explain what you are actually trying to achieve? I think I've got it, but if I have misinterpreted, I don't want to write it out and have you think that I've got it.



Thanks, in advance,
Robin

Last edited by rbatte1; 10-17-2017 at 08:14 AM.. Reason: Added welcome
 

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set_color(1)							       fish							      set_color(1)

NAME
set_color - set_color - set the terminal color set_color - set the terminal color Synopsis set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR] Description Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple, cyan, white and normal. o -b, --background Set the background color o -c, --print-colors Prints a list of all valid color names o -h, --help Display help message and exit o -o, --bold Set bold or extra bright mode o -u, --underline Set underlined mode o -v, --version Display version and exit Calling set_color normal will set the terminal color to whatever is the default color of the terminal. Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey font color, while set_color --bold white will result in a white font color. Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator. set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of ncurses and recompile fish against it in order to fix this issue. Version 1.23.1 Sun Jan 8 2012 set_color(1)
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