The solutions posted so far only deal with part of the problem, converting DOS/Windows' CRLF into Unix's LF; the part they're missing is that DOS use CRLF as a line separator, while Unix uses LF as a line terminator. The difference is that a DOS file (usually) won't have anything after the last line in the file, while Unix will. To do the conversion properly, you need to add that final LF (unless the file is zero-length, i.e. has no lines in it at all). My favorite incantation for this (with a little added logic to handle Mac-style CR-separated files, and not molest files that're already in unix format) is a bit of perl:

perl -pe 'if ( s/\r\n?/\n/g ) { $f=1 }; if ( $f || ! $m ) { s/([^\n])\z/$1\n/ }; $m=1' PCfile.txt

注意，这将把文件的统一版本发送到标准输出。如果你想用一个统一的版本替换这个文件，添加perl的-i标志。

我试着

sed 's/^M$//' file.txt

在OS X以及其他一些方法(修复Dos行结束或http://hintsforums.macworld.com/archive/index.php/t-125.html)。没有一个工作，文件保持不变(顺便说一下，需要按Ctrl + V, Enter来重新生成^M)。最后我使用了TextWrangler。它不是严格意义上的命令行，但它可以工作，而且不会抱怨。

这对我很有效

tr "\r" "\n" < sampledata.csv > sampledata2.csv 

在Bash 4.2及更新版本中，您可以使用类似这样的方法来剥离后面的CR，它只使用Bash内置:

if [[ "${str: -1}" == $'\r' ]]; then
    str="${str:: -1}"
fi

The solutions posted so far only deal with part of the problem, converting DOS/Windows' CRLF into Unix's LF; the part they're missing is that DOS use CRLF as a line separator, while Unix uses LF as a line terminator. The difference is that a DOS file (usually) won't have anything after the last line in the file, while Unix will. To do the conversion properly, you need to add that final LF (unless the file is zero-length, i.e. has no lines in it at all). My favorite incantation for this (with a little added logic to handle Mac-style CR-separated files, and not molest files that're already in unix format) is a bit of perl:

perl -pe 'if ( s/\r\n?/\n/g ) { $f=1 }; if ( $f || ! $m ) { s/([^\n])\z/$1\n/ }; $m=1' PCfile.txt

注意，这将把文件的统一版本发送到标准输出。如果你想用一个统一的版本替换这个文件，添加perl的-i标志。

你可以通过option -c {command}以编程方式使用Vim:

DOS到Unix:

vim file.txt -c "set ff=unix" -c ":wq"

Unix到DOS:

vim file.txt -c "set ff=dos" -c ":wq"

“set ff=unix/dos”表示将文件的fileformat (ff)更改为unix/dos的行尾格式。

":wq"表示将文件写入磁盘并退出编辑器(允许在循环中使用该命令)。