Linux Shell ½ø¶ÈÌõÏÔʾº¯Êý£¨±¸Íü£©

1.µãºÅ½ø¶ÈÏÔʾcode 1
#!/bin/sh
#Êä³ö"."½ø¶ÈÌõº¯Êý£¬¼æÈÝbsh¡¢ksh¡¢bash
#Ê×ÏÈtrap 1 2 3 15Ðźţ¬ÖØÒª
trap 'kill $BG_PID;echo;exit' 1 2 3 15
function dots
      {
      stty -echo >/dev/null 2>&1
      while true
      do
      echo -e ".\c"
      sleep 1
      done
      stty echo
      echo
      }
      #---------------------------------------------
      # Ö÷³ÌÐò¿ªÊ¼
      #---------------------------------------------
      #Ê×ÏÈʹdotsº¯Êýºǫ́ÔËÐÐ
      dots &
      BG_PID=$!
      #¿ªÊ¼³ÌÐòÖ÷Ì壬±¾ÀýÖÐÖ´ÐÐÐÝÃß10Ãë
      #×¢Òâ±ØҪʱ--8
2.¾®ºÅ½ø¶ÈÏÔʾcode 2
#!/bin/sh
abort() {
   printf  "\033[m\n"
   exit
}
#donothing,justsimulatetimeconsume.
idle() {
   i=1
   sum=`date +%S`
   sum=`expr $sum \* $sum | cut -b1`
   sum=`expr $sum \* 10`
   while [ $i -le $sum ]
   do
       i=`expr $i + 2`
       trap abort 2
   done
}
proc() {
   begin=$1
   end=$2
   row=$3
   pos1=`expr $begin + 1`
   pos2=`expr $end - 1`
   mid=`echo "($begin+$end)/2-2" |bc`
   printf "\033[2J"
   printf "\033[${row};${begin}H["
   printf "\033[${row};${end}H]"
   echo ##########################$pos1 -le $pos2
   while [ $pos1 -le $p