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对函数执行循环

tag-icon • tag-icon shell-script
对函数执行循环

我试图在管理员运行脚本时执行一个循环，它会提示他要添加多少个用户，如果他输入 2，我希望在要求用户名和密码的部分运行一个循环例如，如果管理员输入 5，则会询问他用户名和密码 5 次。这可能吗，请告诉我。这是一个课程，我是脚本新手，所以它看起来可能很可怕

#!/bin/bash

read -r -p "Hello Titan, How many users would you like to add to the mainframe : " input
    if [[ $input =~ ^[1-9]$ ]] ; 
    then
        echo "Thank you Titan, Now Adding $input User(s) to the mainframe"
        **if [[ $input == 1 ]] ; then
        read -p "Enter Username : " username
        read -p "Enter password : " username
        egrep "^$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
        else
            echo "Can not add users"
        fi**
    else

        echo "Amount of users invalid"

    fi

答案1

只需将要重复的代码移至函数中即可：

#!/bin/bash

add_user () {
    if [[ $input == 1 ]] ; then
        read -p "Enter Username : " username
        read -p "Enter password : " username
        egrep "^$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
    else
        echo "Can not add users"
    fi
}

read -r -p "Hello Titan, How many users would you like to add to the mainframe : " input
if [[ $input =~ ^[1-9]$ ]] ; then
    echo "Thank you Titan, Now Adding $input User(s) to the mainframe"
    for((i=0;i<input;i++)); do
        add_user
    done
else
    echo "Amount of users invalid"
fi

答案2

在您的帮助下，我能够获得正确的编码，谢谢 Hauke！


read -r -p "Hello Titan, How many users would you like to add to the mainframe : " input
if [[ $input =~ ^[1-9]$ ]] ; then
        echo "Thank you Titan, Now Adding $input User(s) to the mainframe"
        for ((i=0; i<input; i++)) ; do
            read -p "Enter Username : " username
            read -p "Enter password : " username
            egrep "^$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 "Amount of users invalid"
fi

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