How to use the awk output to construct the command

Question

The goal of this is to delete the existing connection name and create the new connections "ABC" "DEF" "GHI" and map to existing device(excluding lo).

#!/bin/bash

conname=$(nmcli con  | awk ' $1 !~ "NAME|lo"{print $1}')
ifname=$(nmcli dev  | awk ' $1 !~ "DEVICE|lo"{print $1}')

echo $conname
echo $ifname

The above returns following values:

test3 test4 test5
enp0s3 enp0s8 enp0s9

How can I produce following command lines by using previous output by awk

nmcli con del test3
nmcli con del test4
nmcli con del test5

The following is to create new connection names "ABC", "DEF", "GHI" which are mapped to interfaces "enp0s3" "enp0s8" "enp0s9". These interfaces were identified by awk. New connection names are fixed names.

nmcli con add type ethernet con-name ABC ifname enp0s3
nmcli con add type ethernet con-name DEF ifname enp0s8
nmcli con add type ethernet con-name GHI ifname enp0s9

I hope this is clearer.

Answer 1

And - as awk is used anyhow - why not

$ nmcli con | awk '$1 !~ "NAME|lo" {print "nmcli con del *" $1 "*"}' 
nmcli con del *test3*
nmcli con del *test4*
nmcli con del *test5*
$ nmcli dev | awk '$1 !~ "DEVICE|lo" {print "nmcli con add type ethernet con-name ABC ifname", $1}'

If you tell us how a "different name i.e. "ABC" "DEF" "GHI" " can be assigned, this could be incorporated as well.

Answer 2

Just pipe the commands through a while loop.

$ nmcli con | awk ' $1 !~ "NAME|lo"{print $1}' | while IFS= read -r line; do echo nmcli con del "$line"; done
nmcli con del test3
nmcli con del test4
nmcli con del test5

For the second command, we create and array of the ABC, DEF, GHI, strings first, then read from this incrementally.

$ declare -a arr
$ arr=(ABC DEF GHI)
$ i=0
$ nmcli dev | awk ' $1 !~ "DEVICE|lo"{print $1}' | while IFS= read -r line; do echo nmcli con add type ethernet con-name ${arr[$i]} ifname "$line"; ((i+=1)); done
nmcli con add type ethernet con-name ABC ifname enp0s3
nmcli con add type ethernet con-name DEF ifname enp0s8
nmcli con add type ethernet con-name GHI ifname enp0s9