Remind me when low on free tapes

I believe NW checks this based on native usage. Not sure which value they use to trigger alert - some stats you get with nsrjb -v at the bottom, for example:

If you wish to have alert for what you asked, you must create script.  I use script to get basic overview (summary and verbose) and here is the summary one (it is function in script and I didn't check if I used any function call defined outside this function; there is couple of other things which I skipped - it won't necessary work for you, but it should get you going - use approach to determine appendable tapes and if number of those is less than 5 have email sent to you):

report_summary() { for LOCATION in `$MMINFO -avot -q near -r location | $SORT -u`; do         TOTVOLREC=0         TOTVOLEMP=0         TOTVOLAPP=0         echo "*****************   Tape library: $LOCATION  ******************"         for POOL in `$MMINFO -avot -q location=$LOCATION -r pool | $SORT -u`; do                 REC_COUNT=`$MMINFO -a -r 'volume' -q "location=$LOCATION,pool=$POOL,volrecycle" 2>&1 | $GREP -v "no matches" | wc -l | tr -s " " | cut -d" " -f2`                 let TOTVOLREC=$TOTVOLREC+$REC_COUNT                 EMP_COUNT=`$MMINFO -a -r 'volume,%used' -q "location=$LOCATION,pool=$POOL,%used=0" 2>&1 | $GREP "0%" | $GREP -v "no matches" | wc -l | tr -s " " | cut -d" " -f2`                 let TOTVOLEMP=$TOTVOLEMP+$EMP_COUNT                 APP_COUNT=`$MMINFO -a -r 'volume' -q "location=$LOCATION,pool=$POOL,!full" 2>&1 | $GREP -v "no matches" | wc -l | tr -s " " | cut -d" " -f2`                 let TOTVOLAPP=$TOTVOLAPP+$APP_COUNT                 echo ""                 echo "Recyclable tapes in pool $POOL: [ $REC_COUNT ]"                 echo "================================================================="                 echo ""                 echo ""                 echo "Empty tapes in pool $POOL: [ $EMP_COUNT ]"                 echo "================================================================="                 echo ""                 echo ""                 echo "Appendable tapes in pool $POOL: [ $APP_COUNT ]"                 echo "================================================================="                 echo ""         done         echo "================================================================="         echo "Total number of recyclable tapes in jukebox: [ $TOTVOLREC ]"         echo "================================================================="         echo "Total number of empty tapes in jukebox: [ $TOTVOLEMP ]"         echo "================================================================="         echo "Total number of appendable tapes in jukebox: [ $TOTVOLAPP ]"         echo "================================================================="         if [ `amm_loc` = "No" ]; then                 echo "Auto Media Management for $LOCATION is disabled (recommended)"         else                 echo "Auto Media Management for $LOCATION is enabled (not recommended)"         fi         echo " "         VALUE1=`$NSRJB -j $LOCATION | $GREP "\-\*" | wc -l 2>&1`         echo "Number of unlabeled tapes in jukebox $LOCATION: [ `echo $VALUE1` ]"         echo " " done