MySQL multi-instance Start and Stop scripts

Mysql multi-instance STARTUP script:

#! /Bin/bash

If ["$1" = ""] (enter the mysq port number to stop)
Then
Echo "Please input mysqld GNR number 110-112" (this is the range of enabled port numbers)

Elif (["$1 "! = "110"] & ["$1 "! = "111"] & ["$1 "! = "112"]) (matches the port number to be closed, and closes the response database instance if the match is successful)
Then
Echo "Please input mysqld port number 110-112"

Else
Mysqld_multi -- defaults-extra-file =/etc/my_multi.cnf start $1
Fi
~

Mysql multi-instance stop script:

#! /Bin/bash

If ["$1" = ""]
Then
Echo "Please input mysqld GNR number 110-112"

Elif (["$1 "! = "110"] & ["$1 "! = "111"] & ["$1 "! = "112"])
Then
Echo "Please input mysqld port number 110-112"

Else
Mysqld_multi -- defaults-extra-file =/etc/my_multi.cnf stop $1
Fi