命令简介：

dos2unix是将Windows格式文件转换为Unix、Linux格式的实用命令。Windows格式文件的换行符为\r\n ,而Unix&Linux文件的换行符为\n. dos2unix命令其实就是将文件中的\r\n 转换为\n。

而unix2dos则是和dos2unix互为孪生的一个命令，它是将Linux&Unix格式文件转换为Windows格式文件的命令。

命令语法：

dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]

unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...]

命令参数：

此命令参数是Red Hat Enterprise Linux Server release 5.7下dos2unix命令参数，不同版本Linux的dos2nnix命令参数有可能不同。

使用示例：

1: 查看dos2unix命令的帮助信息

[root@DB-Server myscript]# man dos2unix[root@DB-Server myscript]# dos2unix -h
dos2unix Copyright (c) 1994-1995 Benjamin LinCopyright (c) 1998      Bernd Johannes Wuebben (Version 3.0)Copyright (c) 1998      Christian Wurll (Version 3.1)
Usage: dos2unix [-hkqV] [-c convmode] [-o file ...] [-n infile outfile ...]-h --help        give this help-k --keepdate    keep output file date-q --quiet       quiet mode, suppress all warningsalways on in stdin->stdout mode-V --version     display version number-c --convmode    conversion modeconvmode         ASCII, 7bit, ISO, Mac, default to ASCII-l --newline     add additional newline in all but Mac convmode-o --oldfile     write to old filefile ...         files to convert in old file mode-n --newfile     write to new fileinfile           original file in new file modeoutfile          output file in new file mode

   [root@DB-Server myscript]# cat -v test.sh . /home/oracle/.bash_profile^Mecho ' '^Mdate^Mecho ' '^M^Msqlplus test/test @/home/oracle/scripts/test.sql^M^Mecho ' '^Mdate^Mecho ' '^M[root@DB-Server myscript]# dos2unix test.sh dos2unix: converting file test.sh to UNIX format ...[root@DB-Server myscript]# cat -v test.sh . /home/oracle/.bash_profileecho ' 'dateecho ' 'sqlplus test/test @/home/oracle/scripts/test.sqlecho ' 'dateecho ' '

dos2unix filename1 filename2 filename3

    [root@DB-Server myscript]# dos2unix -n dosfile linuxfiledos2unix: converting file dosfile to file linuxfile in UNIX format ...[root@DB-Server myscript]# cat -v dosfile it is a windows dos file^Myou should convert to unix&linux format^M[root@DB-Server myscript]# cat -v linuxfile it is a windows dos fileyou should convert to unix&linux format[root@DB-Server myscript]# 

5:保持文件时间戳不变

   [root@DB-Server myscript]# ls -lrt dosfile -rw-r--r-- 1 root root 67 Dec 26 11:46 dosfile[root@DB-Server myscript]# dos2unix dosfile dos2unix: converting file dosfile to UNIX format ...[root@DB-Server myscript]# ls -lrt dosfile -rw-r--r-- 1 root root 65 Dec 26 11:58 dosfile[root@DB-Server myscript]# dos2unix -k dosfile dos2unix: converting file dosfile to UNIX format ...[root@DB-Server myscript]# ls -lrt dosfile -rw-r--r-- 1 root root 65 Dec 26 11:58 dosfile

   [root@DB-Server myscript]# unix2dos -q dosfile [root@DB-Server myscript]# 

dos2unix的下载地址为http://sourceforge.net/projects/dos2unix/ ,可以从上面下载最新版本的dos2unix、unix2dos等命令工具以及相关文档，dos2unix的源码如下所示

/**  Name: dos2unix*  Documentation:*    Remove cr ('\x0d') characters from a file.**  The dos2unix package is distributed under FreeBSD style license.*  See also http://www.freebsd.org/copyright/freebsd-license.html*  --------**  Copyright (C) 2009-2015 Erwin Waterlander*  Copyright (C) 1998 Christian Wurll*  Copyright (C) 1998 Bernd Johannes Wuebben*  Copyright (C) 1994-1995 Benjamin Lin.*  All rights reserved.**  Redistribution and use in source and binary forms, with or without*  modification, are permitted provided that the following conditions*  are met:*  1. Redistributions of source code must retain the above copyright*     notice, this list of conditions and the following disclaimer.*  2. Redistributions in binary form must reproduce the above copyright*     notice in the documentation and/or other materials provided with*     the distribution.**  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY*  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR*  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE*  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT*  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR*  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,*  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE*  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN*  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.**  == 1.0 == 1989.10.04 == John Birchfield (jb@koko.csustan.edu)*  == 1.1 == 1994.12.20 == Benjamin Lin (blin@socs.uts.edu.au)*     Cleaned up for Borland C/C++ 4.02*  == 1.2 == 1995.03.16 == Benjamin Lin (blin@socs.uts.edu.au)*     Modified to more conform to UNIX style.*  == 2.0 == 1995.03.19 == Benjamin Lin (blin@socs.uts.edu.au)*     Rewritten from scratch.*  == 2.1 == 1995.03.29 == Benjamin Lin (blin@socs.uts.edu.au)*     Conversion to SunOS charset implemented.*  == 2.2 == 1995.03.30 == Benjamin Lin (blin@socs.uts.edu.au)*     Fixed a bug in 2.1 where in new-file mode, if outfile already exists*     conversion can not be completed properly.** Added Mac text file translation, i.e. \r to \n conversion* Bernd Johannes Wuebben, wuebben@kde.org* Wed Feb  4 19:12:58 EST 1998** Added extra newline if ^M occurs* Christian Wurll, wurll@ira.uka.de* Thu Nov 19 1998**  See ChangeLog.txt for complete version history.**//* #define DEBUG 1 */#define __DOS2UNIX_C#include "common.h"#include "dos2unix.h"# if (defined(_WIN32) && !defined(__CYGWIN__))#include <windows.h>#endif#ifdef D2U_UNICODE#if !defined(__MSDOS__) && !defined(_WIN32) && !defined(__OS2__)  /* Unix, Cygwin */# include <langinfo.h>#endif#endifvoid PrintLicense(void){printf("%s", _("\Copyright (C) 2009-2015 Erwin Waterlander\n\Copyright (C) 1998      Christian Wurll (Version 3.1)\n\Copyright (C) 1998      Bernd Johannes Wuebben (Version 3.0)\n\Copyright (C) 1994-1995 Benjamin Lin\n\All rights reserved.\n\n"));PrintBSDLicense();}#ifdef D2U_UNICODEwint_t StripDelimiterW(FILE* ipInF, FILE* ipOutF, CFlag *ipFlag, wint_t CurChar, unsigned int *converted, const char *progname){wint_t TempNextChar;/* CurChar is always CR (x0d) *//* In normal dos2unix mode put nothing (skip CR). *//* Don't modify Mac files when in dos2unix mode. */if ( (TempNextChar = d2u_getwc(ipInF, ipFlag->bomtype)) != WEOF) {if (d2u_ungetwc( TempNextChar, ipInF, ipFlag->bomtype) == WEOF) {  /* put back peek char */d2u_getc_error(ipFlag,progname);return WEOF;}if ( TempNextChar != 0x0a ) {if (d2u_putwc(CurChar, ipOutF, ipFlag, progname) == WEOF) {  /* Mac line, put CR */d2u_putwc_error(ipFlag,progname);return WEOF;}} else {(*converted)++;if (ipFlag->NewLine) {  /* add additional LF? */if (d2u_putwc(0x0a, ipOutF, ipFlag, progname) == WEOF) {d2u_putwc_error(ipFlag,progname);return WEOF;}}}} else {if (ferror(ipInF)) {d2u_getc_error(ipFlag,progname);return WEOF;}if ( CurChar == 0x0d ) {  /* EOF: last Mac line delimiter (CR)? */if (d2u_putwc(CurChar, ipOutF, ipFlag, progname) == WEOF) {d2u_putwc_error(ipFlag,progname);return WEOF;}}}return CurChar;}#endif/* CUR        NEXT0xd(CR)    0xa(LF)  => put LF if option -l was used0xd(CR)  ! 0xa(LF)  => put CR0xd(CR)    EOF      => put CR*/int StripDelimiter(FILE* ipInF, FILE* ipOutF, CFlag *ipFlag, int CurChar, unsigned int *converted, const char *progname){int TempNextChar;/* CurChar is always CR (x0d) *//* In normal dos2unix mode put nothing (skip CR). *//* Don't modify Mac files when in dos2unix mode. */if ( (TempNextChar = fgetc(ipInF)) != EOF) {if (ungetc( TempNextChar, ipInF ) == EOF) { /* put back peek char */d2u_getc_error(ipFlag,progname);return EOF;}if ( TempNextChar != '\x0a' ) {if (fputc( CurChar, ipOutF ) == EOF) { /* Mac line, put CR */d2u_putc_error(ipFlag,progname);return EOF;}} else {(*converted)++;if (ipFlag->NewLine) {  /* add additional LF? */if (fputc('\x0a', ipOutF) == EOF) {d2u_putc_error(ipFlag,progname);return EOF;}}}} else {if (ferror(ipInF)) {d2u_getc_error(ipFlag,progname);return EOF;}if ( CurChar == '\x0d' ) {  /* EOF: last Mac line delimiter (CR)? */if (fputc( CurChar, ipOutF ) == EOF) {d2u_putc_error(ipFlag,progname);return EOF;}}}return CurChar;}/* converts stream ipInF to UNIX format text and write to stream ipOutF* RetVal: 0  if success*         -1  otherwise*/#ifdef D2U_UNICODEint ConvertDosToUnixW(FILE* ipInF, FILE* ipOutF, CFlag *ipFlag, const char *progname){int RetVal = 0;wint_t TempChar;wint_t TempNextChar;unsigned int line_nr = 1;unsigned int converted = 0;ipFlag->status = 0;/* CR-LF -> LF *//* LF    -> LF, in case the input file is a Unix text file *//* CR    -> CR, in dos2unix mode (don't modify Mac file) *//* CR    -> LF, in Mac mode *//* \x0a = Newline/Line Feed (LF) *//* \x0d = Carriage Return (CR) */switch (ipFlag->FromToMode){case FROMTO_DOS2UNIX: /* dos2unix */while ((TempChar = d2u_getwc(ipInF, ipFlag->bomtype)) != WEOF) {  /* get character */if ((ipFlag->Force == 0) &&(TempChar < 32) &&(TempChar != 0x0a) &&  /* Not an LF */(TempChar != 0x0d) &&  /* Not a CR */(TempChar != 0x09) &&  /* Not a TAB */(TempChar != 0x0c)) {  /* Not a form feed */RetVal = -1;ipFlag->status |= BINARY_FILE ;if (ipFlag->verbose) {if ((ipFlag->stdio_mode) && (!ipFlag->error)) ipFlag->error = 1;d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Binary symbol 0x00%02X found at line %u\n"),TempChar, line_nr);}break;}if (TempChar != 0x0d) {if (TempChar == 0x0a) /* Count all DOS and Unix line breaks */++line_nr;if (d2u_putwc(TempChar, ipOutF, ipFlag, progname) == WEOF) {RetVal = -1;d2u_putwc_error(ipFlag,progname);break;}} else {if (StripDelimiterW( ipInF, ipOutF, ipFlag, TempChar, &converted, progname) == WEOF) {RetVal = -1;break;}}}if ((TempChar == WEOF) && ferror(ipInF)) {RetVal = -1;d2u_getc_error(ipFlag,progname);}break;case FROMTO_MAC2UNIX: /* mac2unix */while ((TempChar = d2u_getwc(ipInF, ipFlag->bomtype)) != WEOF) {if ((ipFlag->Force == 0) &&(TempChar < 32) &&(TempChar != 0x0a) &&  /* Not an LF */(TempChar != 0x0d) &&  /* Not a CR */(TempChar != 0x09) &&  /* Not a TAB */(TempChar != 0x0c)) {  /* Not a form feed */RetVal = -1;ipFlag->status |= BINARY_FILE ;if (ipFlag->verbose) {if ((ipFlag->stdio_mode) && (!ipFlag->error)) ipFlag->error = 1;d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Binary symbol 0x00%02X found at line %u\n"), TempChar, line_nr);}break;}if ((TempChar != 0x0d)) {if (TempChar == 0x0a) /* Count all DOS and Unix line breaks */++line_nr;if(d2u_putwc(TempChar, ipOutF, ipFlag, progname) == WEOF) {RetVal = -1;d2u_putwc_error(ipFlag,progname);break;}}else{/* TempChar is a CR */if ( (TempNextChar = d2u_getwc(ipInF, ipFlag->bomtype)) != WEOF) {if (d2u_ungetwc( TempNextChar, ipInF, ipFlag->bomtype) == WEOF) {  /* put back peek char */d2u_getc_error(ipFlag,progname);RetVal = -1;break;}/* Don't touch this delimiter if it's a CR,LF pair. */if ( TempNextChar == 0x0a ) {if (d2u_putwc(0x0d, ipOutF, ipFlag, progname) == WEOF) { /* put CR, part of DOS CR-LF */d2u_putwc_error(ipFlag,progname);RetVal = -1;break;}continue;}}if (d2u_putwc(0x0a, ipOutF, ipFlag, progname) == WEOF) { /* MAC line end (CR). Put LF */RetVal = -1;d2u_putwc_error(ipFlag,progname);break;}converted++;line_nr++; /* Count all Mac line breaks */if (ipFlag->NewLine) {  /* add additional LF? */if (d2u_putwc(0x0a, ipOutF, ipFlag, progname) == WEOF) {RetVal = -1;d2u_putwc_error(ipFlag,progname);break;}}}}if ((TempChar == WEOF) && ferror(ipInF)) {RetVal = -1;d2u_getc_error(ipFlag,progname);}break;default: /* unknown FromToMode */;#if DEBUGd2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("program error, invalid conversion mode %d\n"),ipFlag->FromToMode);exit(1);#endif}if (ipFlag->status & UNICODE_CONVERSION_ERROR)ipFlag->line_nr = line_nr;if ((RetVal == 0) && (ipFlag->verbose > 1)) {d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Converted %u out of %u line breaks.\n"), converted, line_nr -1);}return RetVal;}#endif/* converts stream ipInF to UNIX format text and write to stream ipOutF* RetVal: 0  if success*         -1  otherwise*/int ConvertDosToUnix(FILE* ipInF, FILE* ipOutF, CFlag *ipFlag, const char *progname){int RetVal = 0;int TempChar;int TempNextChar;int *ConvTable;unsigned int line_nr = 1;unsigned int converted = 0;ipFlag->status = 0;switch (ipFlag->ConvMode) {case CONVMODE_ASCII: /* ascii */case CONVMODE_UTF16LE: /* Assume UTF-16LE, bomtype = FILE_UTF8 or GB18030 */case CONVMODE_UTF16BE: /* Assume UTF-16BE, bomtype = FILE_UTF8 or GB18030 */ConvTable = D2UAsciiTable;break;case CONVMODE_7BIT: /* 7bit */ConvTable = D2U7BitTable;break;case CONVMODE_437: /* iso */ConvTable = D2UIso437Table;break;case CONVMODE_850: /* iso */ConvTable = D2UIso850Table;break;case CONVMODE_860: /* iso */ConvTable = D2UIso860Table;break;case CONVMODE_863: /* iso */ConvTable = D2UIso863Table;break;case CONVMODE_865: /* iso */ConvTable = D2UIso865Table;break;case CONVMODE_1252: /* iso */ConvTable = D2UIso1252Table;break;default: /* unknown convmode */ipFlag->status |= WRONG_CODEPAGE ;return(-1);}/* Turn off ISO and 7-bit conversion for Unicode text files */if (ipFlag->bomtype > 0)ConvTable = D2UAsciiTable;if ((ipFlag->ConvMode > CONVMODE_7BIT) && (ipFlag->verbose)) { /* not ascii or 7bit */d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("using code page %d.\n"), ipFlag->ConvMode);}/* CR-LF -> LF *//* LF    -> LF, in case the input file is a Unix text file *//* CR    -> CR, in dos2unix mode (don't modify Mac file) *//* CR    -> LF, in Mac mode *//* \x0a = Newline/Line Feed (LF) *//* \x0d = Carriage Return (CR) */switch (ipFlag->FromToMode) {case FROMTO_DOS2UNIX: /* dos2unix */while ((TempChar = fgetc(ipInF)) != EOF) {  /* get character */if ((ipFlag->Force == 0) &&(TempChar < 32) &&(TempChar != '\x0a') &&  /* Not an LF */(TempChar != '\x0d') &&  /* Not a CR */(TempChar != '\x09') &&  /* Not a TAB */(TempChar != '\x0c')) {  /* Not a form feed */RetVal = -1;ipFlag->status |= BINARY_FILE ;if (ipFlag->verbose) {if ((ipFlag->stdio_mode) && (!ipFlag->error)) ipFlag->error = 1;d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Binary symbol 0x%02X found at line %u\n"),TempChar, line_nr);}break;}if (TempChar != '\x0d') {if (TempChar == '\x0a') /* Count all DOS and Unix line breaks */++line_nr;if (fputc(ConvTable[TempChar], ipOutF) == EOF) {RetVal = -1;d2u_putc_error(ipFlag,progname);break;}} else {if (StripDelimiter( ipInF, ipOutF, ipFlag, TempChar, &converted, progname) == EOF) {RetVal = -1;break;}}}if ((TempChar == EOF) && ferror(ipInF)) {RetVal = -1;d2u_getc_error(ipFlag,progname);}break;case FROMTO_MAC2UNIX: /* mac2unix */while ((TempChar = fgetc(ipInF)) != EOF) {if ((ipFlag->Force == 0) &&(TempChar < 32) &&(TempChar != '\x0a') &&  /* Not an LF */(TempChar != '\x0d') &&  /* Not a CR */(TempChar != '\x09') &&  /* Not a TAB */(TempChar != '\x0c')) {  /* Not a form feed */RetVal = -1;ipFlag->status |= BINARY_FILE ;if (ipFlag->verbose) {if ((ipFlag->stdio_mode) && (!ipFlag->error)) ipFlag->error = 1;d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Binary symbol 0x%02X found at line %u\n"),TempChar, line_nr);}break;}if ((TempChar != '\x0d')) {if (TempChar == '\x0a') /* Count all DOS and Unix line breaks */++line_nr;if(fputc(ConvTable[TempChar], ipOutF) == EOF) {RetVal = -1;d2u_putc_error(ipFlag,progname);break;}}else{/* TempChar is a CR */if ( (TempNextChar = fgetc(ipInF)) != EOF) {if (ungetc( TempNextChar, ipInF ) == EOF) {  /* put back peek char */d2u_getc_error(ipFlag,progname);RetVal = -1;break;}/* Don't touch this delimiter if it's a CR,LF pair. */if ( TempNextChar == '\x0a' ) {if (fputc('\x0d', ipOutF) == EOF) { /* put CR, part of DOS CR-LF */RetVal = -1;d2u_putc_error(ipFlag,progname);break;}continue;}}if (fputc('\x0a', ipOutF) == EOF) { /* MAC line end (CR). Put LF */RetVal = -1;d2u_putc_error(ipFlag,progname);break;}converted++;line_nr++; /* Count all Mac line breaks */if (ipFlag->NewLine) {  /* add additional LF? */if (fputc('\x0a', ipOutF) == EOF) {RetVal = -1;d2u_putc_error(ipFlag,progname);break;}}}}if ((TempChar == EOF) && ferror(ipInF)) {RetVal = -1;d2u_getc_error(ipFlag,progname);}break;default: /* unknown FromToMode */;#if DEBUGd2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("program error, invalid conversion mode %d\n"),ipFlag->FromToMode);exit(1);#endif}if ((RetVal == 0) && (ipFlag->verbose > 1)) {d2u_fprintf(stderr, "%s: ", progname);d2u_fprintf(stderr, _("Converted %u out of %u line breaks.\n"),converted, line_nr -1);}return RetVal;}int main (int argc, char *argv[]){/* variable declarations */char progname[9];CFlag *pFlag;char *ptr;char localedir[1024];# ifdef __MINGW64__int _dowildcard = -1; /* enable wildcard expansion for Win64 */# endifint  argc_new;char **argv_new;progname[8] = '\0';strcpy(progname,"dos2unix");#ifdef ENABLE_NLSptr = getenv("DOS2UNIX_LOCALEDIR");if (ptr == NULL)strcpy(localedir,LOCALEDIR);else {if (strlen(ptr) < sizeof(localedir))strcpy(localedir,ptr);else {d2u_fprintf(stderr,"%s: ",progname);d2u_ansi_fprintf(stderr, "%s", _("error: Value of environment variable DOS2UNIX_LOCALEDIR is too long.\n"));strcpy(localedir,LOCALEDIR);}}#endif#if defined(ENABLE_NLS) || (defined(D2U_UNICODE) && !defined(__MSDOS__) && !defined(_WIN32) && !defined(__OS2__))/* setlocale() is also needed for nl_langinfo() */setlocale (LC_ALL, "");#endif#ifdef ENABLE_NLSbindtextdomain (PACKAGE, localedir);textdomain (PACKAGE);#endif/* variable initialisations */pFlag = (CFlag*)malloc(sizeof(CFlag));if (pFlag == NULL) {d2u_fprintf(stderr, "dos2unix:");d2u_ansi_fprintf(stderr, " %s\n", strerror(errno));return errno;}pFlag->FromToMode = FROMTO_DOS2UNIX;  /* default dos2unix */pFlag->keep_bom = 0;if ( ((ptr=strrchr(argv[0],'/')) == NULL) && ((ptr=strrchr(argv[0],'\\')) == NULL) )ptr = argv[0];elseptr++;if ((strcmpi("mac2unix", ptr) == 0) || (strcmpi("mac2unix.exe", ptr) == 0)) {pFlag->FromToMode = FROMTO_MAC2UNIX;strcpy(progname,"mac2unix");}#ifdef D2U_UNIFILE/* Get arguments in wide Unicode format in the Windows Command Prompt */wchar_t **wargv;char ***argv_glob;/* This does not support wildcard expansion (globbing) */wargv = CommandLineToArgvW(GetCommandLineW(), &argc);argv_glob = (char ***)malloc(sizeof(char***));if (argv_glob == NULL) {d2u_fprintf(stderr, "%s:", progname);d2u_ansi_fprintf(stderr, " %s\n", strerror(errno));return errno;}/* Glob the arguments and convert them to UTF-8 */argc_new = glob_warg(argc, wargv, argv_glob, pFlag, progname);argv_new = *argv_glob;#else  argc_new = argc;argv_new = argv;#endif#ifdef D2U_UNICODEreturn parse_options(argc_new, argv_new, pFlag, localedir, progname, PrintLicense, ConvertDosToUnix, ConvertDosToUnixW);#elsereturn parse_options(argc_new, argv_new, pFlag, localedir, progname, PrintLicense, ConvertDosToUnix);#endif}