perl parsing inserting new line and ^M -


i trying modify few strings in file using perl using below logic..

open file1, "< /tmp/sam.dsl" //in read mode open file2, "> /tmp/sam2.dsl" // open in write mode  while(<file1>) if($_=s/string/found/g) push file2, $_...

i able change contents when read file has ^m in it..

my datafile of below format

name 'sample'

i change to

name 'sample2'

currently code changes 

name 'sample2 '

which creates new line , replacement.

do need use anyother mode open file write..?

my guess is, working linux file on windows. perl automatically converts \n \r\n on dos-compatible machines after reading , before writing. rid of behaviour, can use binmode <file> on filehandles, sets filehandle "raw binary mode". if want use other layers (like :utf8 or :encoding(utf-8)) not enabled, , might want set them yourself, if handling character data. use perlio::eol module cpan.

consider looking @ these documentation pages:

  • perlio general understanding how perl-io works.
  • open pragma (not function) set layers 1 program.
  • binmode function might want consider.

my suggestion, can't test (no windows around), use following:

open $outfile, '<:encoding(utf-8)', "filename" or die "error opening: $!"; binmode $outfile, join '', grep {$_ ne ':crlf'} perlio::get_layers($outfile)   or die "error setting output:\n $!"  while(<$infile>){   s/match/replacement/g;   print $outfile $_; }

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