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Top Forums Shell Programming and Scripting Removing ^M from last line alone of a UNIX File Post 302908580 by Don Cragun on Wednesday 9th of July 2014 12:28:34 AM
Old 07-09-2014
If your files are all like this and you want to process them on UNIX Systems and you want to keep carriage return characters in your file that do not appear at the end of a line immediately before a newline character, the following should work:
Code:
#!/bin/ksh
echo >> file  # Add line terminator to partial line at end of file.
sed 's/^M$//' file > file.$$ && mv file.$$ file

(where the ^M in the sed substitute command is a literal carriage return character; not the two characters ^ and M).

Using tr -d or dos2unix is simpler than sed if it is OK to get rid of all carriage return characters (instead of only those that appear at the end of a line).
 

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ASA(1)							    BSD General Commands Manual 						    ASA(1)

NAME
asa -- interpret carriage-control characters SYNOPSIS
asa [file ...] DESCRIPTION
The asa utility reads files sequentially, mapping FORTRAN carriage-control characters to line-printer control sequences, and writes them to the standard output. The first character of each line is interpreted as a carriage-control character. The following characters are interpreted as follows: <space> Output the rest of the line without change. 0 Output a <newline> character before printing the rest of the line. 1 Output a <formfeed> character before printing the rest of the line. + The trailing <newline> of the previous line is replaced by a <carriage-return> before printing the rest of the line. Lines beginning with characters other than the above are treated as if they begin with <space>. EXIT STATUS
The asa utility exit 0 on success, and >0 if an error occurs. EXAMPLES
To view a file containing the output of a FORTRAN program: asa file To format the output of a FORTRAN program and redirect it to a line-printer: a.out | asa | lpr SEE ALSO
f77(1) STANDARDS
The asa utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'') and to X/Open Commands and Utilities Issue 5 (``XCU5''). AUTHORS
J.T. Conklin, Winning Strategies, Inc. BSD
September 23, 1993 BSD
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