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

如果您没有访问dos2unix的权限，但是可以阅读这个页面，那么您可以从这里复制/粘贴dos2unix.py。

#!/usr/bin/env python
"""\
convert dos linefeeds (crlf) to unix (lf)
usage: dos2unix.py <input> <output>
"""
import sys

if len(sys.argv[1:]) != 2:
  sys.exit(__doc__)

content = ''
outsize = 0
with open(sys.argv[1], 'rb') as infile:
  content = infile.read()
with open(sys.argv[2], 'wb') as output:
  for line in content.splitlines():
    outsize += len(line) + 1
    output.write(line + '\n')

print("Done. Saved %s bytes." % (len(content)-outsize))

(超级用户交叉发布。)

对于Mac OS X，如果您安装了Homebrew (http://brew.sh/):)

brew install dos2unix

for csv in *.csv; do dos2unix -c mac ${csv}; done;

确保您已经复制了文件，因为这个命令将在适当的位置修改文件。 -c mac选项使开关与OS X兼容。

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。

这对我很有效

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