| 范文 | 
		     #!/bin/sh     DBSTAT=`ps -ef|grep 'postmaster'|grep -v 'grep'`     if [ "$DBSTAT" == "" ];     then     echo "DB down"     DBstus=`ps -ef|grep 'postmaster'|grep -v 'grep'`     while [ "$DBstus" == "" ];     do     if ["$DBstus" == ""];     then     echo "DB starting ..."     /etc/init.d/postgresql start     DBstus=`ps -ef|grep 'postmaster'|grep -v 'grep'`     else     echo "PostgreSQL already running! "     fi     done     else     echo "DB running"     fi |