可以用expect进行交互，参考如下：

#!/bin/bash
INSTALL_PATH=/dm8
#端口号
PORT_NUM=5236
#SYSDBA密码
PWD=XXXX
NMON_CONF=${INSTALL_PATH}/bin/dmmonitor.ini
/usr/bin/expect << EOF
set timeout 180
spawn ${INSTALL_PATH}/bin/dmmonitor ${NMON_CONF}
expect "monitor"
send "login\r"
expect "username:"
send "SYSDBA\r"
expect "password:"
send "${PWD}\r"
expect "Login dmmonitor success!"
send "show global info\r"
expect "DATABASE GLOBAL INFO:"
send "choose switchover GRP1\r"
expect "1:"
send "switchover\r"
expect "RECOVERY-->OPEN"
send "show global info\r"
expect "DATABASE GLOBAL INFO:"
send "exit\r"
expect eof
EOF