[SOLVED] Running "ip | grep | awk" within a sed replacement

Issue

Problem Set (Raspberry Pi OS): I have a file example.conf that contains a line IPv4addr=XXXXX. I am attempting to change this to the IP that is generated the in the command

ipTest=$(ip --brief a show | grep eth0 | awk '{ print $3 }')

I want to automate this file change during a script install.sh, the line I am attempting is:

IPtest=$(ip --brief a show | grep eth0 | awk '{ print $3 }')
sudo sed -e "/IPv4addr/s/[^=]*$/$IPtest/" example.conf

Returns error:

sed: -e expression #1, char 32: unknown option to `s'

A simple line in that code works, such as SimpleTest='Works'

Any thoughts? I am open to other solutions as well, however I am not an experienced linux user so I am using the tools I know to work with other problem sets.

Solution

$IPtest contains the / character; try something like this:

IPtest=$(ip --brief a show | grep eth0 | awk '{ print $3 }')

sudo sed -e '/IPv4addr/s@[^=]*$@'"$IPtest"'@' example.conf

Answered By - Wiktor Procyk

Answer Checked By - Terry (WPSolving Volunteer)