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bash NEWBIE I/O and I/O redirection problems

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I suspect an appropriate response would be being pointed an 
*atypical* tutorial.
A Google search for "bash tutorial pipe redirect" [w/o quotes] 
gave results for "normal" users. I have and odd use case. I had 
assumed bash as shell but am open to using another shell if it is 
more appropriate.

The following, though using bash syntax, should be considered 
*PSEUDO* code.

# stdout and stderr will be a MATE terminal window
# this was required to address a problem outside scope of this post
gsettings set org.mate.media-handling automount false


while true
   do
     echo "Insert medium, press Enter key (or Ctrl+C to end)"
     read dummyvar
# need code here for /dev/sr0 to be "ready" - I had been watching 
drive activity light
     blocks=$(expr $(/sbin/isosize /dev/sr0) / 2048)
     echo "Block count: "$blocks 		;# to stdout AND "logfile"
     echo "Byte count: $(expr $blocks '*' 2048)" ;# to stdout AND 
"logfile"
     DEVICEBLKCOUNT=$(expr $(cat /sys/class/block/sr0/size) / 4)
     echo "Device block count: "$DEVICEBLKCOUNT	;# to stdout AND 
"logfile"
     echo ""					;# to stdout AND "logfile"
     echo "*********************"		;# to stdout ONLY
     echo "The output file will be $FILENAME"	;# to stdout AND 
"logfile"
     xorriso -indev /dev/sr0  -data_cache_size 512 1024 
-check_media data_to=$FILENAME
     echo ""					;# to stdout AND "logfile"
     echo "next lines are output of ls and isosize commands" ;# 
to stdout ONLY
     ls -l $FILENAME				;# to stdout AND "logfile"
     /sbin/isosize $FILENAME			;# to stdout AND "logfile"
     echo "about to repeat loop"			;# to stdout ONLY
     echo ""					;# to stdout AND "logfile"
   done

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bash NEWBIE I/O and I/O redirection problems Richard Owlett <rowlett@cloud85.net> - 2016-10-25 04:30 +0200
  Re: bash NEWBIE I/O and I/O redirection problems "der.hans" <deb-user@LuftHans.com> - 2016-10-25 05:10 +0200
    Re: bash NEWBIE I/O and I/O redirection problems "Thomas Schmitt" <scdbackup@gmx.net> - 2016-10-25 09:30 +0200
      Re: bash NEWBIE I/O and I/O redirection problems "Thomas Schmitt" <scdbackup@gmx.net> - 2016-10-25 11:30 +0200
    Re: bash NEWBIE I/O and I/O redirection problems Richard Owlett <rowlett@cloud85.net> - 2016-10-25 14:20 +0200
  Re: bash NEWBIE I/O and I/O redirection problems <tomas@tuxteam.de> - 2016-10-25 11:30 +0200
    Re: bash NEWBIE I/O and I/O redirection problems Richard Owlett <rowlett@cloud85.net> - 2016-10-25 14:20 +0200
  Re: bash NEWBIE I/O and I/O redirection problems Greg Wooledge <wooledg@eeg.ccf.org> - 2016-10-25 14:10 +0200

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