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.
The cat will also make different noises, as if he is chocking, in attempt to eliminate the hairballs. If your cat vomits clear liquid without eliminating a hairball soon after that, you should visit the vet and determine the reason your cat vomits clear liquid. Thyroid Problems This can cause the cat to vomit clear liquid. Hyperthyroidism, which is a condition caused by the excess secretion of the thyroid hormone is a disease that is difficult to detect. However, the cat may also present other symptoms such as oily skin, greasy hair, and acne in the facial area or excessive salivation.