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My terminal IDE accessed root but cannot edit hosts file.
email@example.com:/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
# edit, save, then make /system read-only again:
mount -o remount,ro /system
Required, but never shown