bash command substitution problem

[Pollywog <linux-debian@shadypond.com>]

I have a function defined in my .bashrc as:

function lf { /bin/ls -l | grep "^-" ; }

It prints the files in the CWD without listing other directories.

Suppose I want to 'chmod 600' all the files in the CWD without affecting 
directories, I try this:

chmod 600 `lf`

but I get this error:
chmod: invalid character `w' in mode string `-rw-------'


What am I doing wrong?


thanks  8)