shell进度条

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shell编写一个进度条

 i=0
 bar=''
 arr=("\\" "|" "/" "-")
 index=0
 for ((i=1 ;i<101 ;i++))
 do
     printf "[%-100s][%d][%c]\r" "$bar" "$i" "${arr[$index]}"
     bar=$bar'#'
     let index=$i%4
     sleep 0.1
 done
 printf "\n"