Remove carriage return in Unix

Question

What is the simplest way to remove all the carriage returns  r from a file in Unix

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try this to convert dos file into unix file      fromdos file

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I made this shell-script to remove the  r character  It works in solaris and red-hat      bin ksh  LOCALPATH  Any PATH  for File in  ls   LOCALPATH   do    ARCACT   LOCALPATH    File     od -bc   ARCACT  sed -n  p n  sed  s 015 012 g  awk    1     print  0   sed  s      g  awk   printf  0    gt   ARCACT  TMP    printf   cat   ARCACT  TMP   sed      d  gt   ARCACT     rm   ARCACT  TMP done  exit 0

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If you are running an X environment and have a proper editor  visual studio code   then I would follow the reccomendation   Visual Studio Code  How to show line endings  Just go to the bottom right corner of your screen  visual studio code will show you both the file encoding and the end of line convention followed by the file  an just with a simple click you can switch that around   Just use visual code as your replacement for notepad   on a linux environment and you are set to go

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If you are a Vi user  you may open the file and remove the carriage return with     s  r  g   or with    1   s  M     Note that you should type  M by pressing ctrl-v and then ctrl-m

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Though it s a older post  recently I came across with same problem  As I had all the files to rename inside   tmp blah dir  as each file in this directory had   r  trailing character   showing     at end of file   so doing it script way was only I could think of   I wanted to save final file with same name  without trailing any character    With sed  problem was the output filename which I was needed to mention something else   which I didn t want    I tried other options as suggested here  not considered dos2unix because of some limitations  but didn t work    I tried with  awk  finally which worked where I used   r  as delimiter and taken the first part   trick is   echo   filename  awk -F  r    print  1     Below script snippet I used   where I had all file had   r  as trailing character at path  tmp blah dir   to fix my issue   cd  tmp blah dir  for i in  ls    do     mv    i       echo  i   awk -F  r    print  1    done   Note  This example is not very exact though close to what I worked  Mentioning  here just to give the better idea about what I did

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Using sed sed   s  r    infile  gt  outfile  Using sed on Git Bash for Windows sed    infile  gt  outfile  The first version uses ANSI-C quoting and may require escaping   if the command runs from a script  The second version exploits the fact that sed reads the input file line by line by removing  r and  n characters  When writing lines to the output file  however  it only appends a  n character  A more general and cross-platform solution can be devised by simply modifying IFS IFS    r n    or IFS     r  if the lines do not contain whitespace printf  quot  s n quot    cat infile   gt  outfile IFS     t n    not necessary if IFS     r  is used  Warning  This solution performs filename expansion              and more if extglob is set   Use it only if you are sure that the file does not contain special characters or you want the expansion  Warning  None of the solutions can handle   in the input file

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There s a utility called dos2unix that exists on many systems  and can be easily installed on most

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For UNIX    I ve noticed dos2unix removed Unicode headers form my UTF-8 file  Under git bash  Windows   the following script seems to work nicely   It uses sed   Note it only removes carriage-returns at the ends of lines  and preserves Unicode headers      bin bash  inOutFile   1  backupFile    inOutFile    mv --verbose   inOutFile    backupFile  sed -e  s  015   g   lt   backupFile   gt   inOutFile

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Someone else recommend dos2unix and I strongly recommend it as well  I m just providing more details   If installed  jump to the next step  If not already installed  I would recommend installing it via yum like   yum install dos2unix   Then you can use it like   dos2unix fileIWantToRemoveWindowsReturnsFrom txt

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If you re using an OS  like OS X  that doesn t have the dos2unix command but does have a Python interpreter  version 2 5    this command is equivalent to the dos2unix command   python -c  import sys  import fileinput  sys stdout writelines line replace   r     n   for line in fileinput input mode  rU       This handles both named files on the command line as well as pipes and redirects  just like dos2unix   If you add this line to your    bashrc file  or equivalent profile file for other shells    alias dos2unix  python -c   import sys  import fileinput  sys stdout writelines line replace   r     n   for line in fileinput input mode  rU             the next time you log in  or run source    bashrc in the current session  you will be able to use the dos2unix name on the command line in the same manner as in the other examples

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cat input csv   sed  s  r  n g   gt  output csv worked for me

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Once more a solution    Because there s always one more   perl -i -pe  s  r    filename   It s nice because it s in place and works in every flavor of unix linux I ve worked with

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Here is the thing    0d is the carriage return character  To make it compatabile with Unix  We need to use the below command   dos2unix fileName extension fileName extension

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Old School   tr -d   r   lt  filewithcarriagereturns  gt  filewithoutcarriagereturns

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The simplest way on Linux is  in my humble opinion   sed -i  s  r   g   lt filename gt    The strong quotes around the substitution operator  s  r    are essential  Without them the shell will interpret  r as an escape r and reduce it to a plain r  and remove all lower case r  That s why the answer given above in 2009 by Rob doesn t work   And adding the  g modifier ensures that even multiple  r will be removed  and not only the first one

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sed -i s  r    lt filename gt  or somesuch  see man sed or the wealth of information available on the web regarding use of sed   One thing to point out is the precise meaning of  carriage return  in the above  if you truly mean the single control character  carriage return   then the pattern above is correct  If you meant  more generally  CRLF  carriage return and a line feed  which is how line feeds are implemented under Windows   then you probably want to replace  r n instead  Bare line feeds  newline  in Linux Unix are  n

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I m going to assume you mean carriage returns  CR    r   0x0d  at the ends of lines rather than just blindly within a file  you may have them in the middle of strings for all I know   Using this test file with a CR at the end of the first line only     cat infile hello goodbye    cat infile   od -c 0000000   h   e   l   l   o   r   n   g   o   o   d   b   y   e   n 0000017   dos2unix is the way to go if it s installed on your system     cat infile   dos2unix -U   od -c 0000000   h   e   l   l   o   n   g   o   o   d   b   y   e   n 0000016   If for some reason dos2unix is not available to you  then sed will do it     cat infile   sed  s  r       od -c 0000000   h   e   l   l   o   n   g   o   o   d   b   y   e   n 0000016   If for some reason sed is not available to you  then ed will do it  in a complicated way     echo   s  r n  n   gt  w  cat  gt  Q    ed infile 2 gt  dev null   od -c 0000000   h   e   l   l   o   n   g   o   o   d   b   y   e   n 0000016   If you don t have any of those tools installed on your box  you ve got bigger problems than trying to convert files  -

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Removing  r on any UNIX   system   Most existing solutions in this question are GNU-specific  and wouldn t work on OS X or BSD  the solutions below should work on many more UNIX systems  and in any shell  from tcsh to sh  yet still work even on GNU Linux  too   Tested on OS X  OpenBSD and NetBSD in tcsh  and on Debian GNU Linux in bash     With sed   In tcsh on an OS X  the following sed snippet could be used together with printf  as neither sed nor echo handle  r in the special way like the GNU does   sed  printf  s  r   g   input  gt  output     With tr   Another option is tr   tr -d   r   lt  input  gt  output     Difference between sed and tr   It would appear that tr preserves a lack of a trailing newline from the input file  whereas sed on OS X and NetBSD  but not on OpenBSD or GNU Linux  inserts a trailing newline at the very end of the file even if the input is missing any trailing  r or  n at the very end of the file     Testing   Here s some sample testing that could be used to ensure this works on your system  using printf and hexdump -C  alternatively  od -c could also be used if your system is missing hexdump     printf  a r nb r nc    hexdump -C 00000000  61 0d 0a 62 0d 0a 63                               a  b  c  00000007   printf  a r nb r nc      sed  printf  s  r   g    dev stdin  gt   dev stdout     hexdump -C 00000000  61 0a 62 0a 63 0a                                  a b c   00000006   printf  a r nb r nc      tr -d   r   lt   dev stdin  gt   dev stdout     hexdump -C 00000000  61 0a 62 0a 63                                     a b c  00000005

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tr -d   r   lt  infile  gt  outfile   See tr 1

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I ve used python for it  here my code   end1   home     file1 txt  end2   home     file2 txt  with open end1   rb   as inf       with open end2   w   as fixed          for line in inf              line   line replace   n                   line   line replace   r                   fixed write line

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you can simply do this      echo   cat input   gt  output

[unix] Remove carriage return in Unix

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