"We are the IBM. Lower your firewalls and surrender your servers. We will add your financial and technological distinctiveness to our own. Your culture will adapt to service us. Resistance is futile."

Show contents of a file without commented out lines and blank lines

A customer asked me how to display the contents of a text file, in 
this case a configuration file, without showing any blank line, nor 
any lines that started with a "#" character (commented out lines).

We can do this at the Linux command line, using sed, 
if you know how to craft the regex:

sed -e '/^ *#/d' -e '/^$/d' /dir/file.conf

For further reference:  https://www.gnu.org/software/sed/manual/sed.html

There are thousands of resources online: GOOGLE