You can try this, assuming that the logfile already exists and that the command opens the log file for append. This will first start a process that monitors the log file. Then you can start your...
You can use the yw command to yank words so for a number like 1.143 you would use
3yw since vi see this as 3 words "1" "." "143". Then go to where you want to paste it and just use the paste...