shell实现了一个进度条

#!/bin/bash COUNTER=0 _R=0 _C=`tput cols` _PROCEC=`tput cols` tput cup $_C $_R printf "[" while [ $COUNTER -lt 100 ] do     COUNTER=`expr $COUNTER + 1`     sleep 0.1     printf "=>"     _R=`expr $_R + 1`     _C=`expr $_C + 1`     tput cup $_PROCEC 101     printf "]%d%%" $COUNTER     tput cup $_C $_R done printf "\n"