Strange issue with if/test bash commands

Hi,

I ran in to this issue a few months back and found a workaround but
hitting this again I just thought I would ask here and see if someone
has an explanation for this...

This works:
        disable_services.each do |service|
            run <<-CMD
                if [ -x '/etc/init.d/#{service}' ];then
                     chkconfig --level 345 #{service} off;
                fi
            CMD
        end



This fails half way through the loop:
        disabled_services.each do |service|
            run "[[ -x '/etc/init.d/#{service}' ]] && (chkconfig --
level 345 #{service} off;)"
        end

??