One-liner to run commands from a file in parallel using xargs

I have a script like this:

-shell
#!/bin/csh

command 1 \
   -f \"input1\" \
   -l input2 -other_swithes1

command 2 \
   -f \"input1\" \
   -m input2 \
   -l input3 -other_swithes1

command 3 \
   -f \"input1\" \
   -l input2 -other_swithes2

so any idea for an one-liner with xargs to run these commands in parallel. I tried various variants but all failed. I do not really want to write a script, I think that should have been possible with -d switch and -c, not sure though. To simplify and extend the problem further, what I have is

cat file | grep -v "#.*" | sed -z 's/[\]\n/ /g' | xargs -I {} -n1 -P10 sh -c '{}'

and while this does the job there is a particular problem and that is that \" get removed. So any clue how to solve that?!