Shell Programming and Scripting

I am piping some output to awk and would like to print fields $1 $2 and $3 $4 only if they exist.

Note the awk begins with awk '{print $NF " " since I want the last field printed first.

It would be a LOT easier for us to help us if you would:

Thank you Don!

Don, thank you for the feedback; I will try to revise my question.

OS: RHEL
Shell: bash

Code:

DNSname=test1.test.com

InstancePort=8080
ListenerPort=80

InstancePort=8082
ListenerPort=443

The output above is in a file called dns.out
The following is what I would like it to display

Code:

test1.test.com  80 > 8080  443>8081

So port 80 is forwarded to 8080 and 443 is forwarded to 8082

However, within the same query, within my loop I might have a DNSname that has only one listener and Loadbalance port

ie.
test2.test.com. 80 > 8082

So I was trying to use a combination of grep, awk, tr, paste to produce the output

I hope this is clear.

Moderator's Comments:

Please use CODE and ICODE tags as required by forum rules. Do not depend on moderators and administrators to clean up your posts for you.

I don't understand where the 8081 comes from in the output when the input had 8082, and I don't understand why you sometimes have spaces around the > in your output and sometimes do not have spaces.

Assuming that you want to copy various portions of you input file to the input (instead of making up seemingly random numbers) and that you don't really want spaces around the greater than signs, you could try something like:

Code:

awk -F'=' '
/DNSname=/ {		printf("%s", $2) }
/InstancePort=/ {	IP = $2 }
/ListenerPort=/ {	printf(" %s>%s", $2, IP) }
END {			print "" }' dns.out

which, with your sample input, produces the output:

Code:

test1.test.com 80>8080 443>8082

If someone wants to try this script on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.

Also to add to Don's reply, where has the red _full_stop_......
test2.test.com. 80 > 8082
......come from?

These are probably typos but be careful as it throws the rest of us...

Sorry for the confusion as I try to find my way around, it was not deliberate.
The text you put in code tags is not code, not variables, but rather text within a file I would like to query with grep, awk, etc. Thank you