y=`date --date="1 days ago" +%Y`;
m=`date --date="1 days ago" +%m`;
d=`date --date="1 days ago" +%d`; 

 label=/'$y$m$d/'; #备份标签
 
/opt/pgsql/bin/psql -c "select pg_start_backup($label);"; #启动备份
 
cp -r /opt/pgsql/data /backup/databk;  #开始备份
 
/opt/pgsql/bin/psql -c "select pg_stop_backup();"; #结束备份
 
if [ $? ]
 
then
 
 echo "[hxf]  [`date`] hot backup database successfully!"; #备份成功
 
fi