why ^M are added while iam transfering file using binary in Net::FTP

shanthiann has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Why ^M are added while I am transfering file using binary in Net::FTP by davorg (Chancellor) on Sep 12, 2006 at 13:24 UTC
Because line endings are different on Unix (and Linux) and DOS (and Windows). And they don't get translated in binary transfer mode. See my article Why Does My File Have Funny Characters In It? for more details. -- <http://dave.org.uk> "The first rule of Perl club is you do not talk about Perl club." -- Chip Salzenberg	[reply]
Re: why ^M are added while iam transfering file using binary in Net::FTP by gellyfish (Monsignor) on Sep 12, 2006 at 13:24 UTC
No you have it the wrong way round. When you do an FTP transfer in ASCII mode it alters the line endings as appropriate, when in binary mode it doesn't. The ^M you are seeing is part of the Windows line-ending that is not understodd by systems that have Unix line-endings. The Windows line-ending is two characters, whereas the Unix line-ending is one. /J\	[reply]
Re: why ^M are added while iam transfering file using binary in Net::FTP by sen (Hermit) on Sep 12, 2006 at 13:48 UTC
Follow this link, it will be useful dos2unix	[reply]
Re: why ^M are added while iam transfering file using binary in Net::FTP by planetscape (Chancellor) on Sep 12, 2006 at 21:24 UTC
In the quest for a utility to convert between *nix and DOS newlines on a regular basis, I have found flip: Newline conversion between Unix, Macintosh and MS-DOS ASCII files to be useful. It not only converts between DOS and Unix file formats, but also includes a handy `-t` command-line switch to tell you which format a given file uses. HTH, planetscape	[reply] [d/l]
Re: why ^M are added while iam transfering file using binary in Net::FTP by DentArthurDent (Monk) on Sep 12, 2006 at 18:30 UTC
Here's how it should work as I understand it: For ASCII mode, your line endings will be translated if possible. From UNIX to Windows, ^M (carriage return) characters are added. From Windows to UNIX they are removed, I believe. For binary mode, none of that translation is done. So for true text files, often you really want to use ascii mode. However, for just about anything else, you really want binary. You can really pull you hair out if you transfer a linux executable through a windows box back to linux if you use ASCII in one of the transfers. Bottom line: Think carefully, and be consistent! ---- My mission: To boldy split infinitives that have never been split before!	[reply]
Re: why ^M are added while iam transfering file using binary in Net::FTP by runrig (Abbot) on Sep 12, 2006 at 18:36 UTC
if iam using binary it is adding . No, it is not adding them, it is leaving them in. In ascii mode, it removes them.	[reply]


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