Just to pass on snippets, here's what I use:

perl -pe 's/\015\012/\n/g' - dos to unix -- just pipe through it
perl -pe 's/\n/\015\012/g' - unix to dos -- just pipe through it

cat filename |perl -pe 's/\015\012/\n/g' > filename.without.ctrl.m

dos2unix works well, but isn't on all systems. I now use this perl.