bash - 为什么 extglob 除了打破 except 条件？

Question

我在 Debian 8.1、GNU bash、版本 4.3.30(1)-release (x86_64-pc-linux-gnu) 和具有 500 GB SSD 和 8 GB 闪存的 Lenovo G50-30 中运行:

shopt -s extglob
cp -r !(Backups.backupdb/) /home/masi/Documents/

但它还会复制目录 Backups.backupdb/ 中的所有内容，在复制结束时确认。

复制过程中的消息

复制2小时后

cp: cannot stat ‘Backups.backupdb/masi\’s MacBook Air/2015-06-25-233115/Macintosh HD/System/Library/Image Capture/Automatic Tasks/MakePDF.app/Contents/Resources/ko.lproj/3x5로 자르기.mkpdf’: No such file or directory
cp: cannot stat ‘Backups.backupdb/masi\’s MacBook Air/2015-06-25-233115/Macintosh HD/System/Library/Image Capture/Automatic Tasks/MakePDF.app/Contents/Resources/ko.lproj/3x5에 맞추기.mkpdf’: No such file or directory
...
cp: cannot stat ‘Camera Uploads/2015-06-29 11.51.36.jpg’: Invalid argument
cp: cannot stat ‘Camera Uploads/2015-06-29 11.51.53.jpg’: Invalid argument
cp: cannot stat ‘Camera Uploads/Icon\r’: Invalid argument
cp: cannot stat ‘Cancer’: Invalid argument
cp: cannot stat ‘cardio bad/atria-en-ventrikels.swf’: Invalid argument
cp: cannot stat ‘cardio bad/extreme_90_180.swf’: Invalid argument
cp: cannot stat ‘Cardio databases tools’: Invalid argument
cp: cannot stat ‘Cardiology’: Invalid argument
...

我一直意外浏览备份文件夹的地方。这里的挑战是 Backups.backupdb 有几个 TB，看到它继续浏览感觉不太好。

没有符号链接(symbolic link)

我跑

ls -lR /media/masi/eb807ed8-7f45-35f8-a345-9da6692b228a/ |grep Backup

得到

ls: cannot access /media/masi/eb807ed8-7f45-35f8-a345-9da6692b228a/Cancer: Invalid argument
ls: cannot access /media/masi/eb807ed8-7f45-35f8-a345-9da6692b228a/Cardio databases tools: Invalid argument
ls: cannot access /media/masi/eb807ed8-7f45-35f8-a345-9da6692b228a/Cardiology: Invalid argument
drwxr-xr-x 1 root root          7 Jul  8 20:25 Backups.backupdb
ls: cannot open directory /media/masi/eb807ed8-7f45-35f8-a345-9da6692b228a/animations/Embryology/e17_files: Permission denied
^C

所以目录不是符号链接(symbolic link)。为什么extglob except condition通过浏览文件夹在这里被打破了？

Answer 1

尝试删除反斜杠(我添加 echo 用于测试目的):

shopt -s extglob
echo cp -r !(Backups.backupdb) /home/masi/Documents/

它适用于我的环境(GNU bash，版本 4.3.30，OS X)