How to restart Plasma 5 from terminal using nohup?

Question

There are a lot of questions and answers about restarting Plasma 5. I realize that using KRunner is the best option, but today I could not access KRunner and had to use a terminal.

After reading Difference between nohup, disown and &, I felt like these two topics (restarting Plasma 5 and nohub/disown/background jobs) need to be combined into one answer specific to restarting KDE Plasma 5 the right way. Almost every answer I have seen about restarting Plasma 5 ignores the issue of nohup.

By following different answers about restarting Plasma 5, I have, at various times, found myself unable to close a terminal window without killing my newly started Plasma 5 session.

The following script is from a few answers, mostly https://unix.stackexchange.com/a/499373, and is modified to include nohup. Is this the definitive, comprehensive solution? Or is it a mess that needs to be avoided?

#!/bin/sh
kbuildsycoca5 # rebuilds the plasmashell database
timeout 5 kquitapp5 plasmashell #without timeout, it can hang for ~30-60 seconds
pgrep -U $USER -x plasmashell &>/dev/null && pkill -U $USER -x plasmashell
pgrep -U $USER -x plasmashell &>/dev/null && pkill -U $USER -x -9 plasmashell # here the process does not get to clean-up.
killall -9 plasmashell #sends a signal to all processes running any of the specified commands
pgrep -U $USER -x plasmashell &>/dev/null && echo "ERROR: cannot kill plasmashell"
nohup plasmashell &

My specific question is about the last line:

nohup plasmashell &

Is that correct in this context?

Answer 1

Restarting kde apps as in the comments is the wrong way.

I have a script which I call if I wish to restart things such as plasmashell...

#!/bin/sh
for i in $* do
        kquitapp5 ${i}
        PID=$(ps -ax | grep ${i}$ | awk '{print $1}'
        test -n ${PID} && kill -9 ${PID}
        kstart5 ${i}
done