if nested user management script

! # / bin / bash
#author: Li Kun
#date: 2019.8.28
#title: user management system

echo "\\ // ============================="
echo "| user system |"
echo "----- ---------------------------- "
echo" |. @ @ 1 create a user | "
echo" |. @ @ 2 delete users | "
echo" |. @ 3 @ lock the user | "
echo" |. @ 4 @ unlock the user | "
echo" |. @ 5 @ View user | "
echo" |. @ @ 6 launch user | "
echo" --- ------------------------------ "
echo" ----------------- ---------------- "
# specific operations

while true
do

read -p "Enter Your Pick:" aaa
IF [$ aaa -eq 1]
the then
        read -p "Please enter your new user name:" bbb
        [-d / Home / $ bbb]
        IF [$ -? 0 EQ]
        the then
                echo "the user already exists, please try again"
        the else
                useradd $ bbb &> / dev / null
                the Read -p "Please enter your password:" ccc
                echo "$ ccc" | passwd --stdin $ bbb
        fi

# Delete user
elif [$ aaa -eq 2]
the then
        the Read -p "Please enter the user name you want to delete:" dd
        [-d / Home / $ dd]
        IF [? $ -Eq 0]
the then
        userdel -r $ dd
        echo "user deleted"
the else
        echo "this user does not exist, please re-enter your user name to be deleted"
fi

# Lock the user
elif [$ aaa -eq 3]
the then
        the Read -p "Enter the user you want to lock:" GG
        [-d / Home / $ GG]
IF [? $ -Ne 0]
        the then
        echo "user does not exist"
the else
        IF [$ ($ GG the passwd -S | awk '{} Print $ 2') = "the PS"]
        the then
        the passwd -l $ GG &> / dev / null
        echo "successfully locked"
        Fi
Fi

# Unlock the user
elif [$ aaa -eq 4]
the then
        the Read -p "Enter the name you want to unlock:" HH
        [-d / Home / $ HH]
        IF [? $ -Eq 0]
the then
        echo "will unlock ,,, this operation is dangerous "
        IF [$ (HH the passwd -S $ | awk '{} Print $ 2') =" LK "]
        the then
        the passwd -u HH & $> / dev / null
        echo" release success !!!! "
        the else
        echo "the user has been lifted,"
fi
fi
# view the user
elif [$ aaa -eq 5]
the then
        the Read -p "enter the user you want to check in:" tt
        [-d / Home / $ tt]
        IF [$? -eq 0]
the then
        finger tt $
        echo "Well, you found out !!"
the else
        echo "user does not exist, you can not find your garbage !!!!"
fi
# launch script
elif [$ aaa -eq 6]
the then
        IF [$? -eq 0]
        the then
        echo "There is no ending feast! goodbye! "
        BREAK
the else
        echo" you could not walk, baby, hey "
fi
fi

done