File set_postgresql_13.latest.sh of Package dba-postgresql-1323

#!/bin/bash
#set -x
v=`ls -1d 13.? 13.?? 2>/dev/null|cut -d "." -f2 |sort -n |tail -1`
i=`ls -l 13.latest.bak* 2>/dev/null|wc -l`
test -L 13.latest && mv 13.latest 13.latest.bak${i}
rc=`ln -fs 13.${v} 13.latest`
exit $rc