On Mon, Sep 29, 2014 at 1:41 PM, Always Learning <centos at u62.u22.net> wrote: > >> > >> > Thanks. I learned something new today. >> >> Not exactly... Applications that pipe to the sendmail command line >> program to send messages go back to the dawn of email. MTAs that >> replace the 'real' sendmail pretty much have to provide that >> functionality. > > Yes I did learn something new. Just new to you... > I started to use Linux, Centos, in desperation to rid myself of Windoze. > I plunged-in, never learned the theory because of inadequate time. Hence > I am Always Learning and never falling to be impressed, continuously > delighted to be rid of M$ and wishing I have ventured into Linux 10+ > years earlier than I did. If you really want to appreciate the concepts, you should find a unix manual from the days before X was included. Back then there were 5 sections where 1 covered the command line programs, 2 covered system calls, 3 the standard C library, etc. It was small enough that you could read and mostly memorize it, especially section 1, in a few days. The thing to appreciate is that 30+ years later, even in cloned versions, those things were designed well enough that pretty much everything in there still continues to work. -- Les Mikesell lesmikesell at gmail.com