csh loop read variable from user input

[becon]

Dear all
I would like to read the input from user

#!/bin/csh
echo "Please enter a number:"
set cutoff = $< # C shell input from stdin
cluster_struc validate_rmsd.disp $cutoff 4 | cat > file1.out
cluster_struc validate_rmsd.disp $cutoff 4 | wc > file2.out

then read the number of line of file1.out = $line_number
then read the 2nd column of file2.out = $column
if $column -($line_number * 3) < 100 then keep continuing reading the input from user.
Could you please tell me how to do this in csh?
Thank you very much.
best regards
becon