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Full Discussion: Converting DOS filetype to UNIX
Top Forums Shell Programming and Scripting Converting DOS filetype to UNIX Post 302672031 by alister on Sunday 15th of July 2012 04:40:49 PM
Old 07-15-2012
Quote:
Originally Posted by ksk
Thanks to both of you. In addition, my way of doing it (from ARCHIVED: How do I convert between Unix and Mac OS or Mac OS X text files? - Knowledge Base) is
Code:
   awk '{ gsub("\r", "\n"); print $0;}' macfile.txt > unixfile.txt

to go from Mac OS to Unix/Linux.
That is not a very good solution.

That approach will add an extra blank line during the conversion, because after converting the last \r to \n, the awk print statement will add another \n.

If the text file is very large, the conversion will also require a large amount of memory, because awk reads until it finds a \n record separator (which is absent). With some awks, if there's a line length limit, even if you had sufficient memory, the attempt would fail.

In my opinion, the tr utility is tailor-made for this task. It's widely available, simple to use, will not add an extra blank line, and will not consume large amounts of memory even when dealing with monstrous files.
Code:
tr '\r' '\n'

If you insist on using awk, the following is a much better approach (it won't add the extra blank line nor slurp the entire file into memory unless the entire file is one \r-terminated line):
Code:
awk 1 RS='\r' ORS='\n'

My critique aside, thank you for reporting back with your solution. It's always good (and helpful for those who will search the forum in the future) to know how problems were resolved.

Regards,
Alister
Last edited by alister; 07-15-2012 at 05:51 PM..
 

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LEARN ABOUT REDHAT

mac2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - DOS/MAC to UNIX text file format converter

SYNOPSYS

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

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates dos2unix under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      dos2unix

       Convert and replace a.txt. Convert and replace b.txt.

	      dos2unix a.txt b.txt

	      dos2unix -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.  Convert	c.txt  from  Mac  to  Unix
       ascii format.

	      dos2unix a.txt -c iso b.txt

	      dos2unix -c ascii a.txt -c iso b.txt

	      dos2unix -c mac a.txt b.txt

       Convert and replace a.txt while keeping original date stamp.

	      dos2unix -k a.txt

	      dos2unix -k -o a.txt

       Convert a.txt and write to e.txt.

	      dos2unix -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      dos2unix -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      dos2unix a.txt -n b.txt e.txt

	      dos2unix -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHORS

       Benjamin Lin - <blin@socs.uts.edu.au>

       Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       unix2dos(1) mac2unix(1)

1995.03.31							   dos2unix v3.0						       dos2unix(1)
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