从文本文件读取时目录发生变化

Question

我有一个文本文件done.txt，其中包含我需要处理的文件的路径。这是我的done.txt的第一部分：

/data/voice/Voice27Folds/1000/1017_009.flac
/data/voice/Voice27Folds/1000/1017_010.flac
/data/voice/Voice27Folds/1000/1017_013.flac
/data/voice/Voice27Folds/1000/1017_014.flac
/data/voice/Voice27Folds/1000/1017_015.flac
/data/voice/Voice27Folds/1000/1017_020.flac
/data/voice/Voice27Folds/1000/1017_025.flac
/data/voice/Voice27Folds/1000/1017_026.flac
/data/voice/Voice27Folds/1000/1017_027.flac
/data/voice/Voice27Folds/1000/1017_030.flac

.....

当我运行此命令时：

while IFS= read -r var
do
echo "$var" 
done < /data/voice/done.txt

我在done.txt中得到了确切的东西：

/data/voice/Voice27Folds/1000/1017_009.flac
/data/voice/Voice27Folds/1000/1017_010.flac
/data/voice/Voice27Folds/1000/1017_013.flac
/data/voice/Voice27Folds/1000/1017_014.flac
/data/voice/Voice27Folds/1000/1017_015.flac
/data/voice/Voice27Folds/1000/1017_020.flac
/data/voice/Voice27Folds/1000/1017_025.flac
/data/voice/Voice27Folds/1000/1017_026.flac
/data/voice/Voice27Folds/1000/1017_027.flac
/data/voice/Voice27Folds/1000/1017_030.flac

....

然而，当我尝试的时候：

while IFS= read -r var
do
mv "$var" /data/voice #move all files to this directory
done < /data/voice/done.txt

我收到了大量与目录相关的错误，比如下面这个：

mv: cannot stat '/data/voice/Voice27Folds/1000/1017_009.flac\r': No such file and directory
mv: cannot stat '/data/voice/Voice27Folds/1000/1017_013.flac\r': No such file and directory

...

我注意到正确的目录可能已更改，并在末尾附加了"\r“。我怎么才能修复它呢？

Answer 1

$'\r'是一个回车符--这是一条将光标返回到行首的指令。

在DOS (和Windows)上，文本文件的每一行都以$'\r\n' (CRLF)结尾，而在UNIX上，每一行都只以$'\n'结尾。因此，在UNIX上读取DOS文本文件时，每一行似乎都有一个额外的$'\r'。

因为当echo打印该字符时，它会将光标移动到行首，而不是创建任何类型的可视输出，因此无法使用echo "$var"区分是否存在尾随回车符的情况(除非您在后面打印了任何内容-- echo "[$var]"会将]放在行首而不是行尾)。如果您希望以直观明确的方式打印变量内容以显示隐藏字符，请改用printf 'var=%q\n' "$var"。

while IFS= read -r var; do
  var=${var%$'\r'}         # remove any trailing carriage return from var
  mv -- "$var" /data/voice #move all files to this directory
done < /data/voice/done.txt