With sed, you can do:

sed -e 's/\r$//'

The same way can do with tr, you only have to remove \r:

tr -d '\r'

With sed, you can do:

sed 's/\r$//'

The same way can do with tr, you only have to remove \r:

tr -d '\r'

although this will remove all instances of \r, not necessary followed by \n.

With sed, you can do:

sed -e 's/\r//'

The same way can do with tr, you only have to remove \r:

tr -d '\r'

With sed, you can do:

sed -e 's/\r$//'

The same way can do with tr, you only have to remove \r:

tr -d '\r'