Python bash脚本可能出现语法错误，不确定是否尝试使用until循环

大家好，我正在为我的服务器编写一个wol脚本。每次启动时，覆盆子pi都会执行

我想这是一个语法错误，但我现在不知道解决方案，所以我问你。 我在第5行遇到一个错误，但不知道如何更正它

#!/bin/bash

nas=[ping -c 1 192.192.168.222.5 &> /dev/null ]

until [ $nas = "1" ];do
python wol.py
sleep 2
nas=[ping -c 1 192.192.168.222.5 &> /dev/null ]
done

py是marc balmar发送wol包的脚本

#!/usr/bin/env python
#coding: utf8

# Wake-On-LAN
#
# Copyright (C) 2002 by Micro Systems Marc Balmer
# Written by Marc Balmer, marc@msys.ch, http://www.msys.ch/
# Modified by saarnu for nerdoskop.wordpress.com
# This code is free software under the GPL

import struct, socket, time, os

def WakeOnLan(ethernet_address):

  # Construct a six-byte hardware address

  addr_byte = ethernet_address.split(':')
  hw_addr = struct.pack('BBBBBB', int(addr_byte[0], 16),
    int(addr_byte[1], 16),
    int(addr_byte[2], 16),
    int(addr_byte[3], 16),
    int(addr_byte[4], 16),
    int(addr_byte[5], 16))

  # Build the Wake-On-LAN "Magic Packet"...

  msg = '\xff' * 6 + hw_addr * 16

  # ...and send it to the broadcast address using UDP
  time.sleep(5)
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
  s.sendto(msg, ('<broadcast>', 9))
  s.close()

WakeOnLan('C8:60:00:6D:CF:54') # MAC-Adresse der DiskStation

首先，使用修复脚本中的语法问题

您用于命令替换的语法是错误的，使用该修复程序并直接在

until循环中使用退出代码
ping

until ping -c 1 192.192.168.222.5 &> /dev/null
do
    python wol.py
    sleep 2
done

应该能解决你的问题。
ping
的
man
页面显示

如果ping根本没有收到任何回复数据包，它将以代码1退出。如果同时指定了数据包计数和截止日期，并且截止日期到达时收到的数据包少于计数，则它也将以代码1退出。在另一个错误中，它以代码2退出。否则它将以代码0退出。这使得可以使用退出代码查看主机是否处于活动状态

嘿，你的bash脚本中有几个错误，而不是一个

#!/bin/bash

# This is a silent ping. The output is redirected to /dev/null. The only visible
# change in user-land will be the exit code, available as $?.
# The exit code "0" means success, the exit code "1" means some error.

ping -c 1 192.192.168.222.5 &> /dev/null

# You need double round parenthesis here to evaluate a comparison.
# Also a comparison, as almost everywhere in programming, is "==" instead of "=".
until (( $? == "0" ));
    do
    python wol.py
    sleep 2
    # There is the silent ping again. Updating $?.
    ping -c 1 192.192.168.222.5 &> /dev/null
done

有关退出代码，请参阅：

对于不同的括号/括号，请通过
manbash
查看真正优秀的bash手册，或者。
非常简单，谢谢，它现在可以用更少的资源工作了code@SelimAkca：很乐意帮忙！
#!/bin/bash

# This is a silent ping. The output is redirected to /dev/null. The only visible
# change in user-land will be the exit code, available as $?.
# The exit code "0" means success, the exit code "1" means some error.

ping -c 1 192.192.168.222.5 &> /dev/null

# You need double round parenthesis here to evaluate a comparison.
# Also a comparison, as almost everywhere in programming, is "==" instead of "=".
until (( $? == "0" ));
    do
    python wol.py
    sleep 2
    # There is the silent ping again. Updating $?.
    ping -c 1 192.192.168.222.5 &> /dev/null
done