Shell programming - user information management

1 requirement

Write a script file , Complete the function of adding, deleting, modifying and querying information ：
1、main.sh After the script is executed , Menu options appear , If you choose to 1 when , You can add information ; if 2 The specified information can be deleted , When the choice is 3 User information can be modified , When the choice is 4 Query specific users , When the choice is 5 You can view the information of all users , When the choice is 0 Exit the system when .
2、add.sh Scripts are used to add user information .
3、delete.sh The script passes the user name , Find the corresponding record in the configuration file , And delete it , Considering that the user may misoperate , So before you really delete the user information , Confirm first .
4、update.sh The script replaces the input information , First confirm whether the user information needs to be replaced , Then enter the details in turn to replace .

2 Code

main.sh

#!/bin/bash
function show(){
    
echo ""
echo " ********************************"
echo " *  Welcome to the user management system  *"
echo " * *"
echo " * 1、 Add users  *"
echo " * 2、 Delete user  *"
echo " * 3、 Update user information  *"
echo " * 4、 Query the user  *"
echo " * 5、 View all users  *"
echo " * 0、 Exit the system  *"
echo " * *"
echo " ********************************"
}

while true
do
        show
        read -p " Please enter your choice :" choice
        case $choice in
                1)
                        sh add.sh
                        ;;
                2)
                        sh delete.sh
                        ;;
                3)
                        sh update.sh
                        ;;
                4)
                        sh select_user.sh
                        ;;
                5)
                        sh select_all.sh
                        ;;
                0)
                        exit 1
                        ;;

                esac
done
exit 0

add.sh

#!/bin/bash

# set Attribute
# $1:  Parameter name  $2 :  The maximum number of digits 
setAtt(){
    
    read -p " Please enter $1:" temp;
    len=${
    #temp}
    while [ $len -gt $2 ]
    do
        read -p " Input error ,$1 most $2 position , Please re-enter $1:" temp
        len=${
    #temp}
    done
    echo $temp
}

success="true"

while $success
        do
        echo "====================================="
        echo " Please add a user "
        ID=$(setAtt ID 3)
        name=$(setAtt  user name  3)
        password=$(setAtt  password  10)
        role=$(setAtt  role  6)
        sex=$(setAtt  Gender  3)
        age=$(setAtt  Age  3)
        phone=$(setAtt  Phone number  11)
        success="false"
done

user_info="$ID-$name-$password-$role-$sex-$age-$phone"
echo "$user_info" >> user_info.txt
echo " Add success "

Delete.sh

#!/bin/bash
function delete(){
    

echo "==================================="
read -p " Please enter the to be deleted ID:" id
n=1
success="false"
#  Traverse user information 
read -p " Are you sure to delete ？（1 confirm ,0 Cancel ）" ok

if [ "$ok" == "0" ]
then
        echo "... Cancel deletion "
        success="quit"
fi

for line in `cat user_info.txt`
do
ID=""
# Separate user data into arrays 
OLD_IFS="$IFS"
IFS="-"
info=($line)
IFS="$OLD_IFS"
#  If you enter id And... In the user table ID Agreement , Then delete 
if [ "$ok" == "0" ]
then
      success="true"
        sed -i "${n}d" user_info.txt
        break
fi
let n+=1

done
#  Delete the prompt message according to the flag of successful deletion 
if [ $success == "true" ]
then
echo " Delete successful "
elif [ $success != "quit" ]
then
        echo " Delete failed , I didn't find this ID"
fi

}
delete

Update.sh

#!/bin/bash
echo "==================================="
success="false"
read -p " Please enter the user name of the user to be modified :" name
echo " ******************************"
echo " * *"
echo " * 1、 modify id *"
echo " * 2、 Change user name  *"
echo " * 3、 Change Password  *"
echo " * 4、 Modify role  *"
echo " * 5、 Change gender  *"
echo " * 6、 Change the age  *"
echo " * 7、 Change the phone number  *"
echo " * 8、 Modify all  *"
echo " * *"
echo " ******************************"
read -p " Please select the option to be modified :" choice
n=1
old_info=""
for line in `cat user_info.txt`
do
# Save the original data 
old_info=($line)
# Separate user data into arrays 
OLD_IFS="$IFS"
IFS="-"
info=($line)
IFS="$OLD_IFS"
#echo "now id is : ${info[0]},input id is : $id"
if [ "$name" == "${info[1]}" ]
then
case $choice in
        1)
        read -p " Please enter a new value :" value
        user_info="$value-${info[1]}-${info[2]}-${info[3]}-${info[4]}-${info[5]}-${info[6]}"
        ;;
        2)
        read -p " Please enter a new value :" value
         user_info="${info[0]}-$value-${info[2]}-${info[3]}-${info[4]}-${info[5]}-${info[6]}"
        ;;
        3)
        read -p " Please enter a new value :" value
        user_info="${info[0]}-${info[1]}-$value-${info[3]}-${info[4]}-${info[5]}-${info[6]}"
        ;;
        4)
        read -p " Please enter a new value :" value
 user_info="${info[0]}-${info[1]}-${info[2]}-$value-${info[4]}-${info[5]}-${info[6]}"
        ;;
        5)
        read -p " Please enter a new value :" value
        user_info="${info[0]}-${info[1]}-${info[2]}-${info[3]}-$value-${info[5]}-${info[6]}"
        ;;
        6)
        read -p " Please enter a new value :" value
        user_info="${info[0]}-${info[1]}-${info[2]}-${info[3]}-${info[4]}-$value-${info[6]}"
        ;;
        7)
        read -p " Please enter a new value :" value
        user_info="${info[0]}-${info[1]}-${info[2]}-${info[3]}-${info[4]}-${info[5]}-$value"
        ;;
        8)
        echo " Please enter new data "
 read -p " Please enter ID:" ID
                read -p " Please enter a user name :" name
                read -p " Please input a password :" password
                read -p " Please enter the role :" role
                read -p " Please enter gender :" sex
                read -p " Please enter age :" age
                read -p " Please input the phone number :" phone
                user_info="$ID-$name-$password-$role-$sex-$age-$phone"

        ;;
    esac
    success="true"
    break
fi
success="not_found"
#echo "n = $n"
let n+=1
done
if [ $success == "not_found" ]
then
        echo " The user may not be found "
else

echo " The original data : $old_info"
echo " After modification : $user_info"
read -p " Are you sure to modify ？（1 confirm ,0 Cancel ）:" ok
fi

if [ "$ok" == "1" ]
then
        # Delete this data 
        sed -i "${n}d" user_info.txt
        # Insert new data 
        echo "$user_info" >> user_info.txt
elif [ "$ok" == "0" ]
then
        success="quit"
        echo "... Cancel operation "
fi

if [ $success == "true" ]
then
        echo " The update is successful "
fi

Select_user.sh

#!/bin/bash

success="false"

echo "====================================="
read -p " Please enter the user name of the user to be updated :" name
n=1
echo " User information is as follows "
echo -e 'ID\t user name \t password \t role \t Gender \t Age \t Telephone '
for line in `cat user_info.txt`
do
# Separate user data into arrays 
OLD_IFS="$IFS"
IFS="-"
info=($line)
IFS="$OLD_IFS"
#echo "now id is : ${info[0]},input name is : $name"

if [ "$name" == "${info[1]}" ]
then
        success="true"
        echo -e "${info[0]}\t${info[1]}\t${info[2]}\t${info[3]}\t${info[4]}\t${info[5]}\t${info[6]}"
                break
fi

let n+=1
done

# echo "success is $success"
if [ $success != "true" ]
then
        echo " The query fails , The user was not found "
fi

Select_all.sh

#!/bin/bash

success="false"
echo "======================================"
n=1
echo " User information is as follows "
echo -e "ID\t user name \t password \t role \t Gender \t Age \t Telephone "
for line in `cat user_info.txt`
do
# Separate user data into arrays 
OLD_IFS="$IFS"
IFS="-"
info=($line)
IFS="$OLD_IFS"
#echo "now id is : ${info[0]},input id is : $id"
if [ -n "$line" ]
then
        success="true"
        echo -e "${info[0]}\t${info[1]}\t${info[2]}\t${info[3]}\t${info[4]}\t${info[5]}\t${info[6]}"
fi
let n+=1
done
# echo "success is $success"
if [ $success != "true" ]
then
        echo " The query fails , The user may not be found "
fi

Possible problems ：
perform sh ./xxx.sh appear ：“Syntax error: “(” unexpected”
resolvent