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ping：选项需要一个参数 - 'c' 和 'usage: ping'

tag-icon • tag-icon bash shell-script ping
ping：选项需要一个参数 - 'c' 和 'usage: ping'

尝试运行下面的代码，以显示 IP 地址、接收和发送的数据包数量。

#!/bin/bash

interface=$1
ip=$2
packet=$3

if [[ $1 == "-h" ]]
then
    echo "Perform ping command and get an automated result"
    echo "Perform like   ./ping_lan.sh Interface IP Packet "
    echo "Example: ./ping_lan.sh eno1 192.168.7.4 10"
    exit
fi

ping -I $interface -q $ip -c $3 >> ping_summary.txt

transmit=$(grep -o '[0-9]\+ packets transmitted' ping_summary.txt | grep -o '[0-9]\+')

receive=$(grep -o ', [0-9]\+ received' ping_summary.txt | grep -o '[0-9]\+')

packet_loss=$(grep -o ', [0-9]\+% packet loss' ping_summary.txt | grep -o '[0-9]\+')
cat ping_summary.txt >> summary.txt
rm ping_summary.txt

if [[ $transmit -ne $packet ]]
then
    echo -n "FAIL: transmit package is: "
    echo -n $transmit
    echo -n " expected: "
    echo $packet
    exit 1
 fi

 if [[ $receive -ne $packet ]]
 then
    echo -n "FAIL: receive package is: "
    echo -n $receive
    echo -n " expected: "
    echo $packet
    exit 1
 fi


 if [[ $packet_loss -ne 0 ]]
 then
    echo -n "FAIL: transmit package is: "
    echo -n $packet_loss
    echo -n "expected: "
    echo "0"
    exit 1
 fi

 exit 0

我收到的错误是argument requires an argument.我尝试-c用--c和 'usage ping'替换

“usage ping”是什么意思以及为什么会显示？

  • 这个错误是什么意思？
  • 为什么我会收到此错误？
  • 我应该如何避免这个错误？

使用后bash -x script_name，我得到的输出是：

+ interface=
+ ip=
+ packet=
+ [[ '' == \-\h ]]
+ ping -I -q -c 5
Usage: ping [-aAbBdDfhLnOqrRUvV64] [-c count] [-i interval]         [-I interface]
[-m mark] [-M pmtudisc_option] [-l preload] [-p pattern] [-Q tos]
[-s packetsize] [-S sndbuf] [-t ttl] [-T timestamp_option]
[-w deadline] [-W timeout] [hop1 ...] destination
Usage: ping -6 [-aAbBdDfhLnOqrRUvV] [-c count] [-i interval] [-I interface]
[-l preload] [-m mark] [-M pmtudisc_option]
[-N nodeinfo_option] [-p pattern] [-Q tclass] [-s packetsize]
[-S sndbuf] [-t ttl] [-T timestamp_option] [-w deadline]
[-W timeout] destination
++ grep -o '[0-9]\+ packets transmitted' ping_summary.txt
++ grep -o '[0-9]\+'
+ transmit=
++ grep -o ', [0-9]\+ received' ping_summary.txt
++ grep -o '[0-9]\+'
+ receive=
++ grep -o ', [0-9]\+% packet loss' ping_summary.txt
++ grep -o '[0-9]\+'
+ packet_loss=
+ cat ping_summary.txt
do_ping_lan.sh: line 22: summary.txt: Permission denied
+ rm ping_summary.txt
+ [[ '' -ne '' ]]
+ [[ '' -ne '' ]]
+ [[ '' -ne 0 ]]
+ exit 0

我用来调用脚本的命令是：

    sudo ./script_name interface ip packet 
    sudo ./do_ping_lan.sh wlan0 192.168.0.1 5

答案1

您没有正确调用脚本。查看输出：

+ ping -I -q -c 5
Usage: ping [-aAbBdDfhLnOqrRUvV64] [-c count] [-i interval]         [-I interface]

您可以清楚地看到任何参数都没有值，因此为ping您提供了一条使用消息。

稍后的，

+ cat ping_summary.txt
do_ping_lan.sh: line 22: summary.txt: Permission denied

summary.txt您无法在当前目录中写入。您需要写入临时文件（请参阅 StackExchange 上与 相关的答案mktemp）或其他可写文件。

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