linux - 使用循环菜单创建 Bash 文件 (Linux)

Question

*编辑更新状态

我正在尝试制作一个 bash 文件，让您可以选择一个选项，输出答案，然后循环回到菜单选择。截至目前，我拥有的代码是:

#!/bin/sh
echo off
echo "........................................."
echo "Select the process you would like to run."
echo.
echo "1 - Free Disk Space Available"
echo "2 - List Directories"
echo "3 - Show Running Processes"
echo "4 - TCP Connection"
echo "5 - Network Interfaces"
echo "6 - List Directories"
echo "7 - Show Computer Hostname"
echo "8 - Routing Table"
echo "9 - Computer Uptime"
echo "10 - Available Block Devices"
echo "11 - Mount Device"
echo "........................................."

echo -n "Input desired function number and press ENTER: "
read selection
while [ {selection} ]
do
    if [ $selection == 1 ]; then echo df -h
        break
    elif [ $selection == 2 ]; then echo ls -l /home
        break
    elif [ $selection == 3 ]; then echo ps -A
        break
    elif [ $selection == 4 ]; then echo netstat -a
        break
    elif [ $selection == 5 ]; then echo ifconfig
        break
    elif [ $selection == 6 ]; then echo $PATH
        break
    elif [ $selection == 7 ]; then echo hostname
        break
    elif [ $selection == 8 ]; then echo route
        break
    elif [ $selection == 9 ]; then echo uptime
        break
    elif [ $selection == 10 ]; then echo blkid
        break
    elif [ $selection == 11 ]; then echo mount
        break
    else
        echo "Please enter a valid option"
    fi
done

我得到的输出是一个无限循环的错误

[: 2: unexpected operator

如果有人能帮助我或指导我朝着正确的方向前进，我将不胜感激。

Answer 1

对于菜单，使用select 命令。在这里，我使用 bash 将选项存储到一个数组中。

#!/bin/bash

echo ".............................................................................."
echo "Select the process you would like to run by pressing the corresponding number."

choices=(
    "Free Disk Space Available"
    "List Directories"
    "Show Running Processes"
    "TCP Connection"
    "Network Interfaces"
    "List Directories"
    "Show Computer Hostname"
    "Routing Table"
    "Computer Uptime"
    "Available Block Devices"
    "Mount Device"
)

PS3="Input desired function number and press ENTER: "
select selection in "${choices[@]}"
do
    case "$selection" in 
        "${choices[0]}" ) echo df -h ;;
        "${choices[1]}" ) echo ls -l /home ;;
        "${choices[2]}" ) echo ps -A ;;
        "${choices[3]}" ) echo netstat -a ;;
        "${choices[4]}" ) echo ifconfig ;;
        "${choices[5]}" ) echo $PATH ;;
        "${choices[6]}" ) echo hostname ;;
        "${choices[7]}" ) echo route ;;
        "${choices[8]}" ) echo uptime ;;
        "${choices[9]}" ) echo blkid ;;
        "${choices[10]}" ) echo mount ;;
    esac
done

如果你想跳出菜单，你会这样做

        "${choices[10]}" ) echo mount; break ;;

或者添加一个“退出”选项