User Management of shell scripts

! # / usr / bin / env bash 

############################### 
# Script Name: userManager.sh # 
# Script function: account management # 
# script parameters: None # 
# created: 2019-07-25 #	 
# author: Mr.Guo #	 
# version: v1.0 #	 
############### ################ 

# message [] <- () 
note_message () { 
	CAT << the EOF 
	-------- ------ user manager ----- 
		1. Create user 
		2. delete user 
		3. lock user 
		4. unlock the user 
		5. script exits 
the EOF 
} 

# Create account [] <- (user: String, the passwd: String) 
create_user () { 
	user = " 1 $ " 
	pwd =" $ 2 " 

	useradd" $ the User "Add account # 
	echo" $ pwd "| passwd --stdin "$ User "# password
	
	IF [[ "? $" == 0]]; 
	   the then 
		echo "user has successfully created" 
		Exit 
	fi 
} 

# Delete Account [] <- (the User: String) 
DELETE_USER () { 
	the User = "$ 1" 

	userdel "$ the User" # delete user 
	
	IF [[ "$?" == 0]]; 
	   the then 
		echo "has been deleted $ {user} user" 
	Fi 
} 

# locking account [] <- (user: String) 
lock_user () { 
	user = "$. 1" 
	= $ STAT (the passwd -S "User $" | awk '{} Print $ 2') 
	
	IF [[ "$ STAT" == "the PS"]]; 
	   the then 
		the passwd -l "$ User" 
	Fi 
	
	IF [[ "$ STAT "==" LK "]]; 
	   the then 
		echo"$ User has locked the user " 
		Exit 
	Fi 
} 

# Account Unlock [] <- (user: string ) 
unlock_user () { 
	User =" $. 1 " 
	STAT = $ (the passwd -S "User $" | awk '{} Print $ 2') 
	
	IF [[ "$ STAT" == "LK"]]; 
	   the then 
		the passwd -u "$ User" 
	Fi 

	IF [ [ "$ STAT" == "PS"]]; 
	   the then 
		echo "unlocked the User account $" 
		exit 
	fi 
} 

# exit script [] <- () 
exit_script () { 
	the Read -p "whether to exit the script (yes)" tu 
	
	IF [[ "$ TU" == "Yes"]]; 
	   the then 
		Exit 
	Fi 
} 

# main function [] <- () 
main () { 
	note_message # message	 
	
	read -p "Please input operation (1-5): "sn 
	
	Case" $ sn "in 
		1) 
			the Read -p" enter need to create a user name:"Uname 
			the Read -p" Please set a password to the account: "passwduname
			create_user "$uname" "$passwd"
		;;
		2)
			read -p "Enter the user name to be deleted:" uname 
			DELETE_USER "$ uname" 
		;; 
		3) 
			read -p "Please enter the user name needs to be locked in:" uname 
			lock_user "$ uname" 
		;; 
		4) 
			read -p " enter the user name you want to unlock: "uname 
			unlock_user" $ uname " 
		;; 
		5) 
			printf" to exit the script \ the n-" 
			exit_script 
		;; 
	esac 
}		 

# function runs 
main