I am having trouble understanding the command below. I understand the argument -i means 'insert' and the last argument obviously references the file to be altered but could someone explain the second argument - s/ quiet init=.*$//sed -i 's/ quiet init=.*$//' /boot/cmdline.txtThe file /boot/cmdline.txt looks like this: dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet  init=/usr/lib/raspi-config/init_resize.sh
sed question: what does s/ quiet init=.*$// mean?
sed