Question

我用bash编写了一个测试脚本来测试服务器。测试进度百分比将更新，并由测试状态OK或KO代替。

预期以下输出：

Test 1/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 2/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 3/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 4/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 5/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 6/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 7/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 8/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)

但是由于某些原因，文本无法正确更新，因此我得到以下输出：

Test 1/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 2/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 3/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 4/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 5/8 : 10 channel(s) and 100 stream(s) : OK (3000/3000)
Test 6/8 : 10 channel(s) and 100 stream(s) : Processing...
                                              0%
                                              10.00%
                                              20.00%
                                              30.00%
                                              40.00%
                                              50.00%
                                              60.00%
                                              70.00%
                                              80.00%
                                              90.00%
                                              OK (3000/3000)
Test 7/8 : 10 channel(s) and 100 stream(s) : Processing...
                                              0%
                                              10.00%
                                              20.00%
                                              30.00%
                                              40.00%
                                              50.00%
                                              60.00%
                                              70.00%
                                              80.00%
                                              90.00%
                                              OK (3000/3000)
Test 8/8 : 10 channel(s) and 100 stream(s) : Processing...
                                              0%
                                              10.00%
                                              20.00%
                                              30.00%
                                              40.00%
                                              50.00%
                                              60.00%
                                              70.00%
                                              80.00%
                                              90.00%
                                              OK (3000/3000)

如您所见，一旦出现图形错误，它就会不断发生。还要注意，它是随机发生的，有时甚至根本不出现。

这是我的打印循环：

for ((i=0; i < d; i++));
do
        echo "Test $((${i} + 1))/${d} : ${channelTab[i]} channel(s) and ${streamTab[i]} stream(s) : ${saveCursor}Processing..."
        sent=0
        received=0
        errors=0
        e=0
        for ((idx = 0; idx < ${channelTab[i]}; idx++));
        do
                /u/ecmg/bin/simulator ${fileNameTab[i]} > /dev/null 2<&1 &
                pourcentage=$(bc <<< "scale=2;((${idx}))/${channelTab[i]} *100")
                echo ${restoreCursor}${eraseEndOfLine}${saveCursor}${pourcentage}%
                pids[idx]=$!
                sleep .5
        done
        for pid in ${pids[*]}; do
                wait $pid
                results[e]=$(grep -a "stats" "${fileNameTab[i]}.out")
                ((e=e+1))
        done
        for ((f=0; f < e; f++));
        do
                res=$(echo "${results[f]}" | grep -o -E '[0-9]+')
                resArray=($res)
                ((sent=sent + ${resArray[0]}))
                ((received=received + ${resArray[1]}))
                ((errors=errors + ${resArray[2]}))
        done
        if [ "$sent" != "$received" ];
        then
                echo -e "${restoreCursor}${eraseEndOfLine}${red}KO${normal} --> ${errors} errors (${received}/${sent})"
        fi
        if [ "$sent" == "$received" ];
        then
                echo -e "${restoreCursor}${eraseEndOfLine}${green}OK${normal} (${received}/${sent})"
        fi
done

这是${restorCursor}，${eraseEndOfLine}和${saveCursor}的定义方式：

saveCursor=$'\033[s'
restoreCursor=$'\033[u'
eraseEndOfLine=$'\033[K'

你知道为什么会这样吗？

Answer 1

似乎是由于终端的滚动所致，当在屏幕底部打印换行符时，这些行将移至顶部。

一种解决方法是使用printf或echo -n以避免打印换行符。

Bash循环无法正确更新输出

1 个答案: