HGDB进入与退出单用户模式

[highgo@db ~]$ /opt/HighGo6.0.2-cluster/bin/postgres --single -D /opt/HighGo6.0.2-cluster/data highgo
PostgreSQL stand-alone backend 12.3
backend> vacuum freeze ;
backend> 

backend> \q
2022-03-18 13:59:34.200 CST [65498] ERROR:  syntax error at or near "\" at character 1
2022-03-18 13:59:34.200 CST [65498] STATEMENT:  \q

backend> exit
2022-03-18 13:59:35.834 CST [65498] ERROR:  syntax error at or near "exit" at character 1
2022-03-18 13:59:35.834 CST [65498] STATEMENT:  exit

backend> quit
2022-03-18 13:59:37.515 CST [65498] ERROR:  syntax error at or near "quit" at character 1
2022-03-18 13:59:37.515 CST [65498] STATEMENT:  quit
backend> 
backend> Ctrl + D  <--退出单用户模式
[highgo@db ~]$