Question

我正在构建一个最小的标准bash菜单。选择工作正常，但命令未执行。我怀疑我可能会包装命令，但是不确定如何完成。我经常会收到2条命令，因此需要以bash将其理解为命令行的方式来分隔命令。

我发现了这样的标题类似的SO问题，但没有回答为什么不执行bash脚本中的命令的原因：

Cannot execute shell commands in bash script

什么是行不通的？

按1：不会更改为正确的cd。

按2：在正确的文件夹中创建文件。

按3：工作。

按4：Works（R文件准备为：a <-1）。

想要的行为：

我需要执行bash菜单脚本中的命令。

    #!/bin/bash


# -----
# Menu:
# -----

while :
do
echo "Menu"

echo "1 - Change directory to /tmp"
echo "2 - Create file test1.sh with hello message, in /tmp"
echo "3 - Execute test1.sh"
echo "4 - Execute R-script [/tmp/test2.R]"
echo "Exit - any kind but not [1-4]"

read answer;

case $answer in
    1)
    echo "Change directory to [\tmp]"
    cd /tmp # Command to be executed.
    break
    ;;

    2)
    echo "Create file [test1.sh] in [\tmp]"
    # Commands to be executed.
    cd /tmp
    touch test1.sh
    chmod +x test1.sh
    echo echo "hello" > test1.sh
    break
    ;;
    3)
    echo "Execute file [test1.sh]"
    /tmp/./test1.sh # Command to be executed.
    break
    ;;
    4)
    echo "Execute R-script [/tmp/test2.R]"
     cd /tmp && /usr/bin/Rscript test2.R # Command to be executed.
    break
    ;;

    *)
    # Command goes here
    echo "Exit"
    break
    ;;
esac
done

Answer 1

要执行所有情况时，请勿使用break。
并且在您使用/tmp/./test1.sh的情况3中，它应该是./tmp/test1.sh或sh /tmp/test1.sh
您的代码应为：

#!/bin/bash

# -----
# Menu:
# -----

while :
do
    echo "Menu"

    echo "1 - Change directory to /tmp"
    echo "2 - Create file test1.sh in /tmp"
    echo "3 - Execute test1.sh"
    echo "4 - Execute R-script [/tmp/test2.R]"
    echo "Exit - any kind but not [1-4]"

    read answer;

    case $answer in
        1)
            echo "Change directory to [\tmp]"
            cd /tmp # Command to be executed.
            pwd

        ;;

        2)
            echo "Create file [test1.sh] in [\tmp]"
            touch /tmp/test1.sh # Command to be executed.

        ;;
        3)
            echo "Execute file [test1.sh]"
            ./tmp/test1.sh # Command to be executed.

        ;;
        4)
            echo "Execute R-script [/tmp/test2.R]"
            /usr/bin/Rscript /production/20_front_trader/build/x_run_front_trader.R # Command to be executed.

        ;;

        *)
            # Command goes here
            echo "Exit"

        ;;
    esac
done

Bash菜单脚本-无法执行命令

1 个答案: