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.
Loss of appetite and vomiting white foam/bile. This morning when I got up to go and take the dogs out I noticed that one of my dogs had been sick near his bed. He had eaten the previous day but had since had walks and pooed etc. The vomit consisted of a bile/white foamy type substance- no actual food. I noticed in one bit that there was a minute bit that was slightly more congealed (like a small bubble) which had one tiny (I really small) red speck in it. I examined it and I do not believe it was blood but worth mentioning.