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>perl -e "print \"foo\r\nbar\r\nstuff\";" > f.txt

...
0AF7:0100  66 6F 6F 0D 0D 0A 62 61-72 0D 0D 0A 73 74 75 66   foo...bar
+...stuf
0AF7:0110  66                                                f
-q

Select or download this

>perl -i.bak -pe "s/\r(?=\n)//" f.txt

...
-d100 lf
0AF7:0100  66 6F 6F 0D 0A 62 61 72-0D 0A 73 74 75 66 66      foo..bar.
+.stuff
-q