examples/scripts/scrollbar

   1 #!/bin/bash
   2 #
   3 # scrollbar - display scrolling text
   4 #
   5 # usage: scrollbar args
   6 #
   7 # A cute hack originally from Heiner Steven <hs@bintec.de>
   8 #
   9 # converted from ksh syntax to bash v2 syntax by Chet Ramey
  10
  11 WIDTH=${COLUMNS:-80}
  12 WMINUS=$(( $WIDTH - 1 ))
  13
  14 [ $# -lt 1 ] && set -- TESTING
  15
  16 # use the bash-2.02 printf builtin
  17 Text=$(printf "%-${WIDTH}s" "$*")
  18 Text=${Text// /_}
  19
  20 while :
  21 do
  22         printf "%-.${WIDTH}s\r" "$Text"
  23         LastC=${Text:${WMINUS}:1}
  24         Text="$LastC""${Text%?}"
  25 done