Getting Started. Vi is a terminal application, so youâll have to start it from a terminal window. Use the vi /path/to/file command to open an existing file with Vi. The vi /path/to/file command also works if the file doesnât exist yet; Vi will create a new file and write it to the specified location when you save.Remember to use sudo if you want to edit a system file.So, for example, youâd type sudo vi /etc/fstab if you wanted to edit your fstab file.i is a modal text editor, and it opens in command mode. Trying to type at this screen will result in unexpected behavior. While in command mode, you can move the cursor around with the arrow keys. Press the x key to delete the character under the cursor.
1 Persistent vomiting despite the change in diet can be an indication of some inflammatory bowel disease which needs to be treated by a vet. 2  Indigestion: One of the most common causes of a dog throwing up white foam is an upset stomach.
There can be different explanations to your dog throwing up yellow foam, but this usually happens when your dog's stomach is empty of food. To digest food, the liver produces digestive fluid called bile that is stored in the gall bladder and released into the small intestine to digest food.