# Clear the screen and read a file as it's written line-by-line self=clrd # Check we have an input file and are writing to a terminal if [ "$#" -ne 1 ] ; then printf >&2 '%s: Need input file\n' "$self" exit 2 elif ! [ -t 1 ] ; then printf >&2 '%s: stdout not a terminal\n' "$self" exit 2 fi # Clear the screen and start tailing out the file clear tail -f -- "$@"