On Mon, 2014-09-29 at 14:03 -0500, Les Mikesell wrote: > 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... No. Not only to me but also new to others who, like me, never knew. Learning is a continuous process :-) > 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. Design is so important. Get it really right the first time and vast amounts of time and effort are saved. If I ever encounter a Unix book or manual, I'll certainly keep it to read. Thank you. Paul. England, EU.