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perl -0777pe 's/\R?$/\n/' file
-0777 without arguments is equivalent to no record separator (treat the whole file as a single line), so $ equals EOF not EOL.
-0777
no record separator
$
EOF
EOL
\R is equivalent at CRLF (Windows) or LF (Linux) or CR (MAC).
\R
-0777 is equivalent to no record separator (treat the whole file as a single line), so $ equals EOF not EOL.
-00777 without arguments is equivalent to no record separator (treat the whole file as a single line), so $ equals EOF not EOL.
-00777
-0 without arguments is equivalent to no record separator (treat the whole file as a single line), so $ equals EOF not EOL.
-0
perl -0pe0777pe 's/\R?$/\n/' file
perl -0pe 's/\R?$/\n/' file
