Create zonefile records on GTM using TMSH

I also wanted to control zonerunner. Specifically to create 'static' resource records like MX and TXT records. I stumbled across a little shell that seems to be what does the work for the configuration gui: zrsh. Variables, designated @VariableName@, are injected from my management tool- below are some examples of the format.

@Zone@ = 'example.com'
@EscapedZone@ = 'example\.com'
@RecordType@ = 'MX'
@DesiredRecords@ = '"external example.com. example.com. 3600 MX 10 smtp.example.com." "external example.com. example.com. 3600 MX 20 smtp1.example.com." "external example.com. example.com. 3600 MX 20 smtp2.example.com."'
@Authority@ = 'dns.example.com'

Here's the script I ended up with:

!/bin/sh

ZoneFile=/tmp/newzone.external.@Zone@.
Zone=@Zone@
RecordType=@RecordType@
ZoneExists=0
DesiredRecords=(@DesiredRecords@)
Authority=@Authority@

 Check if zone exists
echo "listzones" | zrsh | awk '{ print $2 }' | grep '^@EscapedZone@\.$' && ZoneExists=1

 If zone didn't exist, create it
if [ $ZoneExists -eq 0 ]; then
   Create Zone File Defaults
  ISODate=`date +%Y%m%d`
cat << EOF > ${ZoneFile}
  \$ORIGIN .
  \$TTL 500        ; 8 minutes 20 seconds
  ${Zone}.            IN SOA  ${Authority}. hostmaster.${Zone}. (
  ${ISODate}01 ; serial (YYYYMMDDVV)
                                  10800      ; refresh (3 hours)
                                  3600       ; retry (1 hour)
                                  604800     ; expire (1 week)
                                  60         ; minimum (1 minute)
                                  )
  \$TTL 0  ; 0 seconds
                          NS      ${Authority}.
  \$TTL 3600       ; 1 hour
  \$ORIGIN ${Zone}.
  \$TTL 0  ; 0 seconds
EOF

  echo "addZoneFile external @Zone@. master db.external.@Zone@. \"${ZoneFile}\"" | zrsh

  rm -f ${ZoneFile}
fi

 Strip existing static records
echo "displayzone @Zone@." | zrsh | grep '@RecordType@' | awk '{ cmd=sprintf("echo ''delrr external %s %s %s %s %s %s'' | zrsh ", $1, $1, $2, $4, $5, $6); system(cmd) }'

 Set desired static records
for i in "${DesiredRecords[@]}"; do 
  echo "addrr $i" | zrsh; 
done