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现在我遇到的问题只是“是”或“否”语句。它们不允许输入，但看起来和其他语句一样设置好了……

mc_addplugin() {
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
        echo "$SERVICE is running!"
        echo "Please stop the service before adding a plugin."
    else
        echo "Paste the URL to the .JAR Plugin..."
        read JARURL
        JARNAME=$(basename "$JARURL")
        echo "$JARNAME"
        if [ -d "$TEMPPLUGINS" ]
        then
            as_user "cd $TEMPLUGINS && wget -A.jar -O ./$JARNAME $JARURL"
        else
            as_user "cd $PLUGINSPATH && mkdir $TEMPPLUGINS && cd $TEMPPLUGINS && wget -A.jar -O ./$JARNAME $JARURL"
        fi
        if [ -f "./$JARNAME" ]
        then
            as_user "cd $PLUGINSPATH"
            if [ -f "./$JARNAME" ]
            then
                if `diff $PLUGINSPATH/$JARNAME $TEMPPLUGINS/$JARNAME >/dev/null`
                then 
                    echo "You are already running the latest version of $JARNAME."
                    NOW=`date "+%Y-%m-%d_%Hh%M"`
                    echo "Are you sure you want to overwrite this plugin? [Y/n]"
                    echo "Note: Your old plugin will be moved to the "$TEMPPLUGINS" folder with todays date."
                    select yn in "Yes" "No"; do
                        case $yn in
                            Yes ) as_user "mv $PLUGINSPATH/$JARNAME $TEMPPLUGINS/${JARNAME}_${NOW} && mv $TEMPPLUGINS/$JARNAME $PLUGINSPATH/$JARNAME && rm -rf $TEMPPLUGINS";
                                    echo "Plugin has been install successfully!"; break;;
                            No ) echo "The plugin has not been installed! Removing temporary plugin and exiting..."
                                as_user "rm $TEMPPLUGINS/$JARNAME"; exit;;
                        esac
                    done
                    echo "Would you like to start the $SERVICE now? [Y/n]"
                    select yn in "Yes" "No"; do
                        case $yn in
                            Yes ) mc_start; break;;
                            No ) "$SERVICE not running! To start the service run: /etc/init.d/craftbukkit start"; exit;;
                            esac
                    done
                else
                    NOW=`date "+%Y-%m-%d_%Hh%M"`
                    echo "Are you sure you want to overwrite this plugin? [Y/n]"
                    echo "Note: Your old plugin will be moved to the "$TEMPPLUGINS" folder with todays date."
                    select yn in "Yes" "No"; do
                        case $yn in
                            Yes ) as_user "mv $PLUGINSPATH/$JARNAME $TEMPPLUGINS/${JARNAME}_${NOW} && mv $TEMPPLUGINS/$JARNAME $PLUGINSPATH/$JARNAME && rm -rf $TEMPPLUGINS";
                                    echo "Plugin has been install successfully!"; break;;
                            No ) echo "The plugin has not been installed! Removing temporary plugin and exiting..."
                                as_user "rm $TEMPPLUGINS/$JARNAME"; exit;;
                        esac
                    done
                    echo "Would you like to start the $SERVICE now? [Y/n]"
                    select yn in "Yes" "No"; do
                        case $yn in
                            Yes ) mc_start; break;;
                            No ) "$SERVICE not running! To start the service run: /etc/init.d/craftbukkit start"; exit;;
                            esac
                    done
                fi
            else
                echo "Are you sure you want to add this new plugin? [Y/n]"
                select yn in "Yes" "No"; do
                    case $yn in
                        Yes ) as_user "mv $PLUGINSPATH/$JARNAME $TEMPPLUGINS/${JARNAME}_${NOW} && mv $TEMPPLUGINS/$JARNAME $PLUGINSPATH/$JARNAME"; break;;
                        No ) echo "The plugin has not been installed! Removing temporary plugin and exiting..."
                            as_user "rm $TEMPPLUGINS/$JARNAME"; exit;;
                    esac
                done
                echo "Would you like to start the $SERVICE now? [Y/n]?"
                select yn in "Yes" "No"; do
                    case $yn in
                        Yes ) mc_start; break;;
                        No ) "$SERVICE not running! To start the service run: /etc/init.d/craftbukkit start"; exit;;
                    esac
                done
            fi
        else
            echo "Failed to download the plugin from the URL you specified!"
            exit;
        fi
    fi
}

运行时你会得到类似这样的结果：

You are already running the latest version of Vault.jar.
Are you sure you want to overwrite this plugin? [Y/n]
Note: Your old plugin will be moved to the /home/pyrexiacraft/server/plugins/temp_plugins folder with todays date.
1) Yes
2) No
#? y

答案1

select希望您输入相应的数字；在这种情况下，1 表示是，2 表示否。

不过，用户输入的实际字符串会存储在名为的变量中REPLY，因此除了数字之外，您还可以解析它。

不过，我只想写一个函数来处理是/否问题；是/否查询并不是真正select设计的目的。比如

confirm() {
    local answer
    read -p "$1" -n1 answer
    while [[ $answer && $answer != [YyNn] ]]; do
        printf '\nPlease answer y or n\n' >&2
        read -p "$1" -n1 answer
    done
    printf '\n'
    [[ -z $answer || $answer = [Yy] ]]
}

#...

if confirm "Are you sure? [Y/n] "; then
    printf 'Ok\n'
else
    printf 'Fine, I will find something else to do\n'
fi

Y、y 或 ENTER 将使函数返回 true，N 或 n 将使函数返回 false。您可以扩展它以将默认值作为第二个参数。

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