Question

该脚本的目的是充当目录导航器。目前，我正在尝试使用select循环中的第四个参数来打印当前目录中的所有目录。我了解我需要使用命令替换，但不了解如何正确实施反引号。

#! /bin/bash

echo"###################################################################"

pwd | ls -l


#problem with bad substitution below inbetween backticks
select choice in quit back jump ${`ls -l | egrep '^d' | awk $9`};
do

        case $choice in
         "quit")
                echo "Quitting program"
                exit 0
                break
         ;;

        "back")
 cd ..
                echo "Your have gone back to the previous directory: " `pwd`
                pwd 
                ls -l
         ;;

         "jump")
                echo "Enter the directory you want to move into"
                read inputDir
 if [[ -d $inputdir ]]; then
                        cd $inputDir
                        pwd
                        ls -l
                else
                        echo "Your input is not a directory, Please enter correct Di$
                fi
                ;;

         ${ls -l | egrep '^d' | awk $9}) 
        esac
        done

Answer 1

您应该真正考虑使用shellcheck来整理您的Shell脚本。

我使用mapfile根据输出创建一个数组。我还使用find代替ls，因为它可以更好地处理非字母数字文件名。

然后我创建一个附加输出的数组。可以采用不同的方法，但这是最简单的方法。有关bash数组here的更多信息。

#! /bin/bash


echo"###############################################################"
pwd  # Your script had a |, it doesn't do anything since ls -l, doesn't take
     # input from stdin. I seperated them, because that's probably what you want
ls -l


mapfile -t output < <(find . -type d -maxdepth 1 -not -name '.*' | sed -e 's/^\.\///')
choices=(quit back jump "${output[@]}")

select choice in "${choices[@]}"; do
    case $choice in
        "quit")
            echo "Quitting program"
            exit 0
            break
        ;;
        "back")
            cd ..
            echo "Your have gone back to the previous directory: $(pwd)"
            pwd
            ls -l
        ;;
        "jump")
            echo "Enter the directory you want to move into"
            read -r inputDir
            if [[ -d $inputDir ]]; then
                cd "$inputDir" || exit
                pwd
                ls -l
            else
                echo "Your input is not a directory, Please enter correct Di$"
            fi
        ;;
    esac
done

如何在选择循环中正确使用命令替换

1 个答案: