一个带进度条的cp 命今,但只能cp 一个文件, 文件很大时有效果

/root/cp.sh
#!/bin/bash

SOURCE=$1
TARGET=$2

#CP=./fack_cp
CP=cp

$CP "$SOURCE" "$TARGET" &
CPID=$!

isalive(){
        out=`ps -p $1 2> /dev/null`
        return $?
}

while [ 1 ]; do {
        SSIZE=`/bin/ls -l $SOURCE | gawk "{print \\\$5}"`
        if [ -f $TARGET ]; then
                TSIZE=`/bin/ls -l $TARGET | gawk "{print \\\$5}"`
        else
                TSIZE="0"
        fi
        PERCENT=`echo "scale=2; $TSIZE/$SSIZE*100" | bc -l`
        RATE=`echo "scale=0; 63*$PERCENT/100" | bc -l`
        BLUE="\\033[3;44m"
        NORMAIL="\\033[0;39m"

        BAR=$BLUE
        i=0
        while [ $i -le 62 ]; do
                [ "$i" == "$RATE" ] && BAR=$BAR"\\033[7;39m"
                BAR=$BAR" "
                i=$((i+1))
        done
        BAR=$BAR$NORMAIL
        echo -en "\r$BAR ${PERCENT}%"
        if ! isalive "$CPID"; then echo -en "\n"; exit; fi
        sleep 1
}
done