Remounting a read-only filesystem on Android

Following on from my last post, I figured that copying the hosts file from my laptop to my phone would be a very good idea. In principle, this is just a case of getting the file onto my phone and then copying it to /etc/hosts.

Obviously, I need root access to do this but, with a Fairphone 1 this is not a problem.

What did catch me out, though, is that /system is mounted as a read only file system. It’s not difficult to get around, but I am noting it here so I can easily look up the steps when I next do this.

# mount -o rw,remount /system
# cp /storage/sdcard0/Download/hosts /etc
# mount -o ro,remount /system

For other phones, some pathnames may vary.