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