一个拷贝进度条的实现

#!/bin/sh
# Last modified: 2013年12月27日21:00:51 [test]

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=$BAR" "
                let i=$i+1
        done
        BAR=$BAR$NORMAIL
        echo -en "r$BAR ${PERCENT}%"
        if ! isalive "$CPID"; then echo -en "n"; exit; fi
        sleep 1
}
done
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