python - 在 cli 函数中使用 python 的子进程会破坏命令行

Question

我编写了一个 python 脚本来批处理视频文件，并为其创建了一个 CLI 绑定(bind)。您可以找到存储库 here .

作为脚本的一部分(因为视频处理是计算密集型的)我是 using Python's subprocess module to achieve some parallelization .

我从命令行调用我的脚本:

repositorg vidproc -p "-crf 16 -c:a copy -filter:v 'crop=1080:1080:420:0'" nd750_a00{80..86}.MOV

而且效果很好。但是，执行后，它破坏了我的终端。我再也看不到我在输入什么，但它仍然被发送到终端。这是我多次终止当前行，然后键入 ls 并按回车键的示例:

chymera@zenbookhost ~/data/cameras/nd750/a $ ^C
chymera@zenbookhost ~/data/cameras/nd750/a $ ^C
chymera@zenbookhost ~/data/cameras/nd750/a $ ^C
chymera@zenbookhost ~/data/cameras/nd750/a $ ^C
chymera@zenbookhost ~/data/cameras/nd750/a $ nd750_a0000.mkv  nd750_a0016.mkv  nd750_a0032.mkv  nd750_a0048.mkv  nd750_a0064.mkv  nd750_a0079.MOV
nd750_a0001.mkv  nd750_a0017.mkv  nd750_a0033.mkv  nd750_a0049.mkv  nd750_a0065.mkv  nd750_a0080.mkv
nd750_a0002.mkv  nd750_a0018.mkv  nd750_a0034.mkv  nd750_a0050.mkv  nd750_a0066.mkv  nd750_a0080.MOV
nd750_a0003.mkv  nd750_a0019.mkv  nd750_a0035.mkv  nd750_a0051.mkv  nd750_a0067.mkv  nd750_a0081.mkv
nd750_a0004.mkv  nd750_a0020.mkv  nd750_a0036.mkv  nd750_a0052.mkv  nd750_a0068.mkv  nd750_a0081.MOV
nd750_a0005.mkv  nd750_a0021.mkv  nd750_a0037.mkv  nd750_a0053.mkv  nd750_a0069.mkv  nd750_a0082.mkv
nd750_a0006.mkv  nd750_a0022.mkv  nd750_a0038.mkv  nd750_a0054.mkv  nd750_a0070.mkv  nd750_a0082.MOV
nd750_a0007.mkv  nd750_a0023.mkv  nd750_a0039.mkv  nd750_a0055.mkv  nd750_a0071.mkv  nd750_a0083.mkv
nd750_a0008.mkv  nd750_a0024.mkv  nd750_a0040.mkv  nd750_a0056.mkv  nd750_a0072.mkv  nd750_a0083.MOV
nd750_a0009.mkv  nd750_a0025.mkv  nd750_a0041.mkv  nd750_a0057.mkv  nd750_a0073.mkv  nd750_a0084.mkv
nd750_a0010.mkv  nd750_a0026.mkv  nd750_a0042.mkv  nd750_a0058.mkv  nd750_a0074.mkv  nd750_a0084.MOV
nd750_a0011.mkv  nd750_a0027.mkv  nd750_a0043.mkv  nd750_a0059.mkv  nd750_a0075.mkv  nd750_a0085.mkv
nd750_a0012.mkv  nd750_a0028.mkv  nd750_a0044.mkv  nd750_a0060.mkv  nd750_a0076.mkv  nd750_a0085.MOV
nd750_a0013.mkv  nd750_a0029.mkv  nd750_a0045.mkv  nd750_a0061.mkv  nd750_a0077.mkv  nd750_a0086.mkv
nd750_a0014.mkv  nd750_a0030.mkv  nd750_a0046.mkv  nd750_a0062.mkv  nd750_a0078.mkv  nd750_a0086.MOV
nd750_a0015.mkv  nd750_a0031.mkv  nd750_a0047.mkv  nd750_a0063.mkv  nd750_a0079.mkv

如您所见，ls 没有被打印出来，但它的输出是，尽管从提示符开始...

我在想:

• 这是怎么回事？
• 一旦发生这种情况，我该如何修复我的终端？
• 如何防止我的脚本破坏终端？

Answer 1

一些进程可能关闭了echo。这可以使用 stty 命令进行检查。通常情况是这样的:

$ stty
speed 38400 baud; line = 0;
-brkint ixoff -imaxbel iutf8

如果它被关闭:

$ stty -echo

然后回车4次，输入stty:

$ $ $ $ $ speed 38400 baud; line = 0;
-brkint ixoff -imaxbel iutf8
-echo

要重新打开它，只需调用 stty echo。