awk Command to add Carriage Return and Line Feed Post: 303024737

Sponsored Content

Top Forums UNIX for Beginners Questions & Answers awk Command to add Carriage Return and Line Feed Post 303024737 by Don Cragun on Tuesday 16th of October 2018 05:26:04 AM

10-16-2018

Registered User

Neither awk nor sed have defined behavior according to the standards if the file being processed is not a text file. If an input file contains any characters and the last character in the file is not a <newline> character, that input file is not a text file. (So the code Scrutinizer suggested also depends on GNU extensions to awk that are not portable and not required by the standards.)

Assuming that all lines in your file are separated by DOS <carriage-return><newline> line separators and you just want to add a <carriage-return><newline> terminator to the last line of a file if it doesn't already exist, and assuming that an empty input file should produce an empty output file (not adding a DOS format empty line), the following POSIX-conforming shell script should be portable to most systems:

Code:

{ cat "${1:-file}"; printf '\r\n'; } | awk '
{	if(empty)
		print "\r"
	if($0 != "\r") {
		print
		empty = 0
	} else	empty = 1
}' > "${2:-newfile}"

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.

This script takes two operands. The first operand is the name of the input file you want to process. The second operand is the name of the output file you want to produce. If neither of these operands are specified on the command line, the input file name defaults to file and the output file name defaults to newfile.

Don Cragun

View Public Profile for Don Cragun

Find all posts by Don Cragun

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

carriage return/line feeds

Hello, I have a file that has got carriage returns in it and I want to take them out. Anyone know how I can do this in a ksh? thanks

2. Shell Programming and Scripting

Removing Carriage Return and or line feed from a file

Hello I'm trying to write a shell script which can remove a carriage return and/or line feed from a file, so the resulting file all ends up on one line. So, I begin with a file like this text in file!<CR> line two!<CR> line three!<CR> END!<CR> And I want to end up with a file...

3. Shell Programming and Scripting

How to insert carriage return before line feed?

I am doing some edi where translations had to be run on unix. Generally when I run the translations on windows, the output file has both carriage returns and line feed where as when ran on unix will have only line feed. I need to insert carriage return before the line feed. Is there some tool...

4. UNIX for Dummies Questions & Answers

To remove carriage return between the line

Hi, I have a situation where I need to remove the carriage return between the lines. For.eg. The input file: 1,ad,"adc sdfd",edf 2,asd,"def fde",asd The output file should be 1,ad,adc sdfd,edf 2,asd,def fde,asd Thanks Shash

5. Shell Programming and Scripting

Insert a line including Variable & Carriage Return / sed command as Variable

I want to instert Category:XXXXX into the 2. line something like this should work, but I have somewhere the wrong sytanx. something with the linebreak goes wrong: sed "2i\\${n}Category:$cat\n" Sample: Titel Blahh Blahh abllk sdhsd sjdhf Blahh Blah Blahh Blahh Should look like...

6. Programming

Carriage return or line feed issues

I keep running into the same problem with the following script. Every time it prints the carrage (line feed) char when I test. I believe that the issue is in the group by but I do not see it. The code is as follows. SET FEED OFF SET ECHO OFF SET HEADING OFF SET LINESIZE 1000 SET PAGESIZE...

7. Shell Programming and Scripting

Why sed command deletes last line in a file if no carriage return?

Hi I am using sed command to make SCORE=somevalue to SCORE=blank in a file. Please see the attached lastline.txt file. After executing the below command on the file, it removes the last line. cat lastline.txt | sed 's/SCORE=.*$/SCORE=/g' > newfile.txt Why does sed command remove the...

8. Shell Programming and Scripting

refine awk command in replacing carriage return

Hi, need your help in below,I have 4 types of file need to be processed so that it will replace carriage return in Remarks column with <:::> Remarks column position may varies in different types of file. sample file: col1|col2|col3|col4|col5|col6|col7|Remarks|col9|col10...

9. Shell Programming and Scripting

line carriage return characters

Hi, I would like to insert the line carriage retrun characters on each line.

10. Shell Programming and Scripting

Losing carriage return (X0D) after running awk command

Hi Forum. I'm running the following awk command to extract the suffix value (pos 38) from the "AM00" record and append to the end of the "AM01" record. awk 'substr($0,13,4)=="AM00" {SUFFIX = substr($0,38,2)} substr($0,13,4)=="AM01" {$0 = $0 SUFFIX} 1' before.txt > after.txt Before.txt:...

LEARN ABOUT OPENSOLARIS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

carriage return/line feeds

Discussion started by: pitstop

2. Shell Programming and Scripting

Removing Carriage Return and or line feed from a file

Discussion started by: tbone231

3. Shell Programming and Scripting

How to insert carriage return before line feed?

Discussion started by: huey ing

4. UNIX for Dummies Questions & Answers

To remove carriage return between the line

Discussion started by: shash