下面是转载的一段sh脚本：

#!/bin/bash

if [ $# -ne 1 ]; then 
  echo "Usage: $0 file"
  exit 1  
fi

TSIZE=0
for FSIZE in $(tar tvvf $1 | awk '{print $3}'); do
    if [ "$FSIZE" = "${FSIZE//[^0-9]/}" ]; then 
        TSIZE=$((TSIZE+FSIZE))
    fi
done

[ $TSIZE -eq 0 ] && exit 1

MSG="Extracting..."
PROG_POS=$((${#MSG}+1))
PERC_POS=$((${#MSG}+53))

echo $MSG

PREV=-1
NSIZE=0
for FSIZE in $(tar xvvf $1 | awk '{print $3}'); do
    if [ "$FSIZE" = "${FSIZE//[^0-9]/}" ]; then 
        NSIZE=$((NSIZE+FSIZE))
        PERCENT=$((NSIZE*100/TSIZE))
        if [ $PERCENT -ne $PREV ]; then 
            PLUS=$((PERCENT/2))
            PROGRESS=$(printf "%.${PLUS}d" | tr '0' '+')
            echo -e "\e[A\e[${PROG_POS}G${PROGRESS}=>"
            echo -e "\e[A\e[${PERC_POS}G${PERCENT}%"
            PREV=$PERCENT
        fi      
    fi
done