> For the complete documentation index, see [llms.txt](https://close.gitbook.io/yun-wei-bi-ji/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://close.gitbook.io/yun-wei-bi-ji/python/python-xiao-ji-qiao/shi-yong-shell-he-python-fen-bie-shi-xian-jian-dan-cai-dan-gong-neng.md).

# 使用shell和python分别实现简单菜单功能

### shell 方式

```bash
#!/bin/bash
 
User ()
{
       echo "用户登录记录："
       echo "`last`"
}
 
Ifcfg ()
{
        echo "本机网卡信息如下：" 
        echo "`ifconfig`"
}
 
Netstat ()
{
        echo "http的并发请求数及其TCP连接状态:" 
        echo "`netstat -n | awk '/^tcp/ {++S$NF]} END {for(a in S) print a, S[a]}'`" 
}
 
Nfsstat ()
{
   echo " NFS 状态:" 
   echo "`nfsstat -cn`" 
}
 
System ()
{
   echo " 系统版本:"
   echo "`lsb_release -a`"
}
 
Disk ()
{
   echo " 磁盘分区使用情况:"
   echo "`df -h`"
}
 
IO ()
{
   echo " 磁盘I/O:"
   echo "`iostat -dx`"
}
 
Top ()
{
   echo " cpu、内存使用情况:"
   echo "`vmstat 5`"
}
 
PS3="请输入您的选择:"
A="查看当前用户:查看当前网卡参数:查看http并发数:查看NFS状态:系统版本:磁盘分区使用情况:磁盘IO
:cpu内存使用情况:退出脚本" && IFS=:
  select i in ${A};do
    case $i in
          查看当前用户)
           User
          ;;
          查看当前网卡参数)
           Ifcfg
          ;;
          查看http并发数)
           Netstat
          ;;
          查看NFS状态)
           Nfsstat
          ;;
          系统版本)
           System
          ;;
          磁盘分区使用情况)
           Disk
          ;;
          磁盘IO)
           IO
          ;;
          cpu内存使用情况)
           Top
          ;;
          退出脚本)
           exit 0 ;;
          *)
          echo "没有正确的选择"; exit 1;;
    esac
done

```

### python 方式

```python
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Filename: systemstatus.py
 
import os
# swich case 实现
# This class provides the functionality we want. You only need to look at
# this if you want to know how this works. It only needs to be defined
# once, no need to muck around with its internals.
class switch(object):
    def __init__(self, value):
        self.value = value
        self.fall = False
 
    def __iter__(self):
        """Return the match methd once, then stop"""
        yield self.match
        raise StopIteration
 
    def match(self, *args):
        """Indicate whether or not to enter a case suite"""
        if self.fall or not args:
            return True
        elif self.value in args: # changed for v1.5, see below
            self.fall = True
            return True
        else:
            return False
 
def print_menu():
    menu = {
        1: "查看当前用户",
        2: "查看当前网卡参数",
        3: "查看http并发数",
        4: "查看nfs状态",
        5: "系统版本",
        6: "磁盘分区使用情况",
        7: "磁盘IO",
        8: "cpu内存使用情况",
        9: "打印这个菜单"
    }
    print('系统信息查看工具菜单：')
    # 打印整个菜单
    for i in menu:
        print(i, menu[i])
    return
lst = print_menu()
print(lst)
# while True 的部分实现了一个永远不会自己停止的循环。但是在循环内部的if语句中加入条件是可以的，在条件满足时调用break语句。
# 这样一来就可以早循环内部任何地方而不是只在开头（像普通的while循环一样）终止循环。
# if/break 语句自然地将循环分为两个部分：第一部分负责初始化（在普通的while循环中，这部分需要重复），第二部分则在循环条件
# 为真的情况下使用第一部分内初始化好的数据。
while True:
    item = input('请输入菜单编号(1-9，留空退出程序):')
    if not item: break
    for case in switch(item):
        if case('1'):
            print('当前用户信息:')
            os.system('last')
            break
        if case('2'):
            print('当前网卡参数:')
            os.system('ifconfig')
            break
        if case('3'):
            print('http并发数:')
            os.system("netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'")
            break
        if case('4'):
            print('nfs状态:')
            os.system('nfsstat -cn')
            break
        if case('5'):
            print('系统版本:')
            os.system('lsb_release -a')
            break
        if case('6'):
            print("磁盘分区使用情况")
            os.system('df -h')
            break
        if case('7'):
            print('磁盘IO:')
            os.system('iostat -dx')
            break
        if case('8'):
            print('cpu内存使用情况:')
            os.system('vmstat 5')
            break
        if case('9'):
            lst = print_menu( )
            print(lst)
            break
        if case(''):
            print("退出!")
            exit(1)

```


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