Bash脚本添加，删除用户？

Question

我目前正在尝试创建一个脚本，在运行此特定bash脚本时向用户呈现任何特定人员。在菜单上我允许三个选项（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，尽管我一直无法为添加用户手动创建任务的脚本/主体，也无法通过txt文件和删除用户创建多个用户。

任何与我的代码的帮助将不胜感激！非常感谢！

这里是我的脚本，截至目前：

#!/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

为了得到主意如何打破一个大的脚本成小部分。接下来是远远的从一个很好的代码，但你可以得到的想法，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