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How to convert ^M appearing at end of line to unix newline?

 
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Top Forums UNIX for Dummies Questions & Answers How to convert ^M appearing at end of line to unix newline?
# 22  
Old 09-01-2007
Hi.

Perhaps this will help:
Quote:
Software applications and operating systems usually represent a newline with one or two control characters:

* Systems based on ASCII or a compatible character set use either LF (Line feed, 0x0A) or CR (Carriage Return, 0x0D) individually, or CR followed by LF (CR+LF, 0x0D0A); see below for the historical reason for the CR+LF convention. These characters are based on printer commands: The line feed indicated that one line should feed out of the printer, and a carriage return indicated that the printer carriage should return to the beginning of the current line.

o LF: Multics, Unix and Unix-like systems (GNU/Linux, AIX, Xenix, Mac OS X, etc.), BeOS, Amiga, RISC OS, and others

o CR+LF: DEC RT-11 and most other early non-Unix non-IBM OSes, CP/M, MP/M, MS-DOS, OS/2, Microsoft Windows

o CR: Commodore machines, Apple II family and Mac OS up to version 9

-- excerpt from Newline - Wikipedia, the free encyclopedia
This thread has many useful comments. However, the OP has not returned to tell what s/he used.

One way to ask these kinds of questions is to include a sample of what the line really looks like, such as:
Code:
% od -bc hello
0000000 110 145 154 154 157 054 040 167 157 162 154 144 056 015 012
          H   e   l   l   o   ,       w   o   r   l   d   .  \r  \n

Or with a different choice of arguments:
Code:
% od -oac hello
0000000 062510 066154 026157 073440 071157 062154 006456 000012
          H   e   l   l   o   ,  sp   w   o   r   l   d   .  cr  nl nul
          H   e   l   l   o   ,       w   o   r   l   d   .  \r  \n  \0

Then responders may more easily provide advice ... cheers, drl
 
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