linux - Bash 脚本添加、删除用户？

Question

我目前正在尝试创建一个脚本，在运行这个特定的 bash 脚本时向任何特定的人显示一个菜单。在菜单上，我允许使用三个选项(1.添加用户，2.删除用户和3.退出)。关于添加用户选项，一旦选择，应该有 2 个选项，允许用户手动输入新用户的详细信息或通过文本文件添加多个用户。我已经能够创建上述菜单/选项，尽管我无法为手动添加用户和通过 txt 文件创建许多用户以及删除用户创建任务的脚本/正文。

任何对我的代码的帮助将不胜感激!非常感谢!

这是我现在的脚本:

    #!/bin/bash
clear
echo "########## MENU ############\n"
options=("add_user" "delete_user" "exit")
select opt in "${options[@]}"
do
case $opt in
    "add_user")
        clear
    while [ 1 ]
do
  clear
  echo "1. Add user manually"
  echo "2. Add user via TXT file"
  read -p "Enter your choice" ch
  case $ch in 
      1)
        read -p "Enter user name : " useradd
       read -p "Enter user password:" passwd
    echo -e "Successfully added the user"
    ;;
    2)
   if [ $(id -u) -eq 0 ]; then
  for row in `more $1`
  do
  username=${row%:*}
  password=${row#*:}

 egrep "^$username" /etc/passwd >/dev/null

 if [ $? -eq 0 ]; then
    echo "$username exists!"
    exit 1
 else
    pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
    useradd -m -p $pass $username
    [ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a 
user!"    
fi
done
else
    echo "Only root may add a user to the system"
    exit 2
fi    
esac  
done
    ;;
    "delete_user")
        read -p "Enter a User name to delete "UNAME
        passwd
        deluser $UNAME
        echo "User $UNAME has been deleted"         

        ;;
    "exit")
        break
        ;;

    esac
done

Answer 1

了解如何将大脚本分成小部分。接下来的代码距离好代码还很遥远，但您可以了解如何继续。

#!/bin/bash

setps3() {
    PS3="$1 (press enter for choices)>"
}
setmainprompt() {
    setps3 "Main menu"
}
setaddprompt() {
    setps3 "ADD USER menu"
}

pressenter() {
    read -p "Press enter to continue:" _tmp
}

err() {
    echo 1>&2 ${CMDNAME} ERROR: $*
    return 1
}
msg() {
    echo ${CMDNAME} NOTICE: $*
    return 0
}

badchoice() {
    err "Bad choice!";
    return 1
}

do_add_one_user() {
    _name="$1"
    _pass="$2"
    echo "add code here for adding one user: ${_name} ${_pass}"
    pressenter
}

do_manual_add() {
    read -p "Username:" _username
    read -sp "Passowrd:" _password
    echo
    do_add_one_user "${_username}" "${_password}"
}

do_txt_add() {
    read -p "Filename:" _filename
    [[ -z "${_filename}" ]] && return
    echo "add code here for adding users from ${_filename}"
    echo "The code should call do_add_one_user function for every line"
    pressenter
}

do_adduser() {
    setaddprompt
    _arr_add=("Add manually" "Add via TXT" "return to main menu" "exit program")
    select add_action in "${_arr_add[@]}"
    do
        case "$REPLY" in
            1) do_manual_add ;;
            2) do_txt_add ;;
            3) return ;;
            4) exit 0 ;;
            *) badchoice ;;
        esac
        setaddprompt
    done
}

do_deleteuser() {
    echo "enter code for deleting user here"
    pressenter
}

uidcheck() {
    owner=${owner:-$(/usr/bin/id -u)}
    if [ "$owner" != "0" ]; then
        err 'Must be root'
        exit 1
    fi
}

## MAIN PROGRAM

CMDNAME=$(basename $0)
#uidcheck   #uncomment when need

_arr_main=("Add user" "Delete user" "Exit program")
setmainprompt
select main_action in "${_arr_main[@]}"
do
    case "$REPLY" in
        1) do_adduser ;;
        2) do_deleteuser  ;;
        3) exit 0 ;;
        *) badchoice ;;
    esac
    setmainprompt
done