trail

trail is command line tool which keeps only the last n lines of a stream on the terminal screen.

It behaves exactly as tail command if the input is not a continuos stream. Otherwise it behaves as if tail is being run at every point of time.

Arguments

trail command only accept one optional argument:

-l, --lines (default: 5)
	Defines how many lines should be kept on terminal.
	To disable trailing pass 0.

Examples

# Will show results of only recent 10 pings
ping 8.8.8.8 | trail_lines --lines 10

# Will behave similar to `tail` command 
ls | trail_lines -l 20