Hi,

While I was going through the configuration file of sendmail i.e. sendmail.mc

I was a little surprised to see the format of the file

So, can anyone please explain me which is the commented and uncommented line in this file

for eg.

What is the use of dnl??
Why is it used at the end of the line?

*******************************************************************

Another query is for the smb.conf file

what is the use of giving ; in the starting of line?

for eg:

*******************************************************************

Please can anyone clear my doubts

dnl is a m4 command meaning "Delete through New Line".
You can use it for comments or to avoid the insertion of blank lines, so the "define" command will produce a blank line.
The second situation is used because m4 replaces its commands with empty lines.

for smb.conf ; means a commented line.