Edit hosts file from terminal IDE with root accessed My terminal IDE accessed root but cannot edit hosts file.

root@172.16.0.151:/system/etc #vim hosts


But vim just opens hosts file as readonly. Where do I missed here?
You've missed that the /system file system is mounted read-only.

mount -o remount,rw /system
cd /system/etc
vim hosts
# edit, save, then make /system read-only again:
mount -o remount,ro /system