In Perl how to remove M from a file

Question

I have a script that is appending new fields to an existing CSV  however  M characters are appearing at the end of the old lines so the new fields end up on a new row instead of the same one  How do I remove  M characters from a CSV file using Perl

User · Answer

Or a 1-liner   perl -p -i -e  s  r n   n g  file1 txt file2 txt     filen txt

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In vi hit     Then s Control-VControl-M  g   Control-V Control-M are obviously those keys  Don t spell it out

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To convert DOS style to UNIX style line endings   for   line in  lt FILEHANDLE gt         line    s  r n   n       Or  to remove UNIX and or DOS style line endings   for   line in  lt FILEHANDLE gt         line    s  r  n

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I prefer a more general solution that will work with either DOS or Unix input   Assuming the input is from STDIN   while  defined my  ln    lt  gt            chomp  ln       chop  ln  if   ln    m  r            filter and write

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Slightly unrelated  but to remove  M from the command line using Perl  do this   perl -p -i -e  s  r n  n g  file name

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You found out you can also do this    line   tr  015  d

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M is carriage return  You can do this    str    s  r  g

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Little script I have for that  A modification of it helped to filter out some other non-printable characters in cross-platform legacy files      usr bin perl   run this as   convert dos2unix pl  lt  input file  gt  output file undef           lt  gt   s  r  ge  print

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This is what solved my problem   M is a carriage return  and it can be easily avoided in a Perl script   while  lt INPUTFILE gt          chomp       chop     if        m  r

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This one liner replaces all the  M characters   dos2unix  lt file-name gt    You can call this from inside Perl or directly on your Unix prompt

[perl] In Perl, how to remove ^M from a file?

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