The following works (use getent passwd, not getent group): ps -C pulseaudio -o uid= | tr -d ' ' | sed s/$(getent passwd pulse | awk -F: '{print $3}')//
The following works (use getent passwd, not getent group):
ps -C pulseaudio -o uid= | tr -d ' ' | sed s/$(getent passwd pulse | awk -F: '{print $3}')//