linux中没有dos2UNIX或者UNIX2dos命令怎么解决办法

背景：用cygwin运行shell命令发现符号会报错，查了发现没有多余的字符。

原因：linux中回车换行是两个字符，windows中是一个字符。

解决办法：在notepad++上代开code，点击视图-显示所有字符，会看到回车确实是两个字符，点击编辑，将字符转换成unix格式即可。

下面是查找到的解决办法。

[root@localhost ~]#dos2unix tr.py 
-bash: dos2unix: command not found

安装方法：

在http://linux.softpedia.com/progDownload/Dos2Unix-Download-5519.html下载hd2u-1.0.0.tgz

[root@localhost ~]#tar -zxf hd2u-1.0.0.tgz

[root@localhost ~]#cd hd2u-1.0.0

[root@localhost ~]#./configure

 Configuring hd2u 1.0.0
 checking for gcc... gcc
 checking for C compiler default output file name... a.out
 checking whether the C compiler works... yes
 checking whether we are cross compiling... no
 checking for suffix of executables...
 checking for suffix of object files... o
 checking whether we are using the GNU C compiler... yes
 checking whether gcc accepts -g... yes
 checking for gcc option to accept ANSI C... none needed
 checking for a BSD-compatible install... /usr/bin/install -c
 checking for getopt_long in -lpopt... no
 configure: error: *** libpopt not found

 Configuring hd2u 1.0.0
 checking for gcc... gcc
 checking for C compiler default output file name... a.out
 checking whether the C compiler works... yes
 checking whether we are cross compiling... no
 checking for suffix of executables...
 checking for suffix of object files... o
 checking whether we are using the GNU C compiler... yes
 checking whether gcc accepts -g... yes
 checking for gcc option to accept ANSI C... none needed
 checking for a BSD-compatible install... /usr/bin/install -c
 checking for getopt_long in -lpopt... no
 configure: error: *** libpopt not found

在http://rpm.pbone.net/index.php3/stat/4/idpl/17960519/dir/other/com/popt-1.14-2rt.x86_64.rpm.html下载popt-1.14-2rt.x86_64.rpm

[root@localhost ~]#rpm  -ivh popt-1.14-2rt.x86_64.rpm

[root@localhost ~]#cd hd2u-1.0.0

[root@localhost ~]#./configure&&make&&make install

[root@localhost ~]#whereis dos2unix

dos2unix: /usr/local/bin/dos2unix

安装成功