View only the new entries in a growing log file

You can try:

tail -n0 -f x.log

From man page:

-n, --lines=K
output the last K lines, instead of the last 10; or use -n +K to output lines starting with the Kth

You can use the -n0 option to show 0 lines. So

tail -n0 -f some.log

You can also use less command like

1. less file_name.log (log file will be opened and will show first page of the log file)
2. press shift + f (to act same as like tail -f)
3. In case if you need to search for any keyword in log file. press ctrl + c to exit the tail mode and search for the keyword as /keyword and ?keyword.