如何使这个多选择Bash脚本默认为所有选定的项目？

Question

我修改了Nathan在serverfault.com上在网上找到的一个很棒的脚本，但是我已经达到了我对Bash的认识的极限！

它工作得很好，除了我必须选择每一项之外，我希望它以开始，从所有选定的开始，并且必须取消选择它们。

#!/bin/bash
ERROR=" "
declare -a install
declare -a options=('php' 'phpmyadmin' 'php-mysqlnd' 'php-opcache' 'mariadb-server' 'sendmail')

#===  FUNCTION  ========================================================================
#         NAME:  ACTIONS
#  DESCRIPTION:  Actions to take based on selection
# PARAMETER  1:
#=======================================================================================
function ACTIONS() {

    for ((i = 0; i < ${#options[*]}; i++)); do
        if [[ "${choices[i]}" == "+" ]]; then
            install+=(${options[i]})
        fi
    done
    echo "${install[@]}"
}

#===  FUNCTION  ========================================================================
#         NAME:  MENU
#  DESCRIPTION:  Ask for user input to toggle the name of the plugins to be installed
# PARAMETER  1:
#=======================================================================================
function MENU() {
    echo "Which packages would you like to be installed?"
    echo
    for NUM in "${!options[@]}"; do
        echo "[""${choices[NUM]:- }""]" $((NUM + 1))") ${options[NUM]}"
    done
    echo "$ERROR"
}

#Clear screen for menu
clear

#Menu loop
while MENU && read -e -p "Select the desired options using their number (again to uncheck, ENTER when done): " -n2 SELECTION && [[ -n "$SELECTION" ]]; do
    clear
    if [[ "$SELECTION" == *[[:digit:]]* && $SELECTION -ge 1 && $SELECTION -le ${#options[@]} ]]; then
        ((SELECTION--))
        if [[ "${choices[SELECTION]}" == "+" ]]; then
            choices[SELECTION]=""
        else
            choices[SELECTION]="+"
        fi
        ERROR=" "
    else
        ERROR="Invalid option: $SELECTION"
    fi
done

ACTIONS

Answer 1

在这里，您只需要在实际处理choices[] (数组)之前初始化它们。(重新)修改后的代码(感谢查尔斯·达菲)：

#!/bin/bash
ERROR=" "
declare -a install
declare -a options=('php' 'phpmyadmin' 'php-mysqlnd' 'php-opcache' 'mariadb-server' 'sendmail')

############### HERE's THE NEW BIT #################
declare -a choices=( "${options[@]//*/+}" )
####################################################

#===  FUNCTION  ========================================================================
#         NAME:  ACTIONS
#  DESCRIPTION:  Actions to take based on selection
# PARAMETER  1:
#=======================================================================================
function ACTIONS() {

    for ((i = 0; i < ${#options[*]}; i++)); do
        if [[ "${choices[i]}" == "+" ]]; then
            install+=(${options[i]})
        fi
    done
    echo "${install[@]}"
}

#===  FUNCTION  ========================================================================
#         NAME:  MENU
#  DESCRIPTION:  Ask for user input to toggle the name of the plugins to be installed
# PARAMETER  1:
#=======================================================================================
function MENU() {
    echo "Which packages would you like to be installed?"
    echo
    for NUM in "${!options[@]}"; do
        echo "[""${choices[NUM]:- }""]" $((NUM + 1))") ${options[NUM]}"
    done
    echo "$ERROR"
}

#Clear screen for menu
clear

#Menu loop
while MENU && read -e -p "Select the desired options using their number (again to uncheck, ENTER when done): " -n2 SELECTION && [[ -n "$SELECTION" ]]; do
    clear
    if [[ "$SELECTION" == *[[:digit:]]* && $SELECTION -ge 1 && $SELECTION -le ${#options[@]} ]]; then
        ((SELECTION--))
        if [[ "${choices[SELECTION]}" == "+" ]]; then
            choices[SELECTION]=""
        else
            choices[SELECTION]="+"
        fi
        ERROR=" "
    else
        ERROR="Invalid option: $SELECTION"
    fi
done

ACTIONS

对不起，但我没时间对这一切进行吹嘘。在这种情况下，set -vx的传统shell调试工具(与set +vx配对)对于新手来说可能是一个挑战。只有在你能抽出时间的时候才做实验。

请注意，关键代码位是切换+的位置：

if [[ "${choices[SELECTION]}" == "+" ]]; then
    choices[SELECTION]=""
else
    choices[SELECTION]="+"
fi

IHTH