title: Print a line of log file continuosly in current buffer
body: <p>How to print only one line of my log file (that is showing the log progress) continuously in present buffer? I could not find tail -f working for me.</p>
  
  <p>Basically, I have made my own command using function call in .vimrc and later on I have opened the quickfix window to show the compilation errors. Presently, i am just echoing the message "running software in background" which seems static and the user may think that the system is hanged if he runs a large design. How can I show my progress simultaneously in the current buffer from the log file which ius updated continuously?</p>