ping: 選項需要一個參數 – ‘c’ 和 ‘usage: ping’

嘗試執行以下程式碼，以顯示 IP 地址、接收和發送的數據包數。

#!/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argument requires an argument. 我嘗試替換-c為--c“使用 ping”

“使用 ping”是什麼意思，為什麼會顯示？

• 這個錯誤是什麼意思？
• 為什麼我會收到此錯誤？
• 我應該如何避免這個錯誤？

使用後bash -x script_name，我得到的輸出是：

+ 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

我用來呼叫腳本的命令是：

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

您沒有正確呼叫腳本。看看輸出：

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

您可以清楚地看到任何參數都沒有值，因此ping會給您一個使用消息。

稍後的，

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

您不能summary.txt在目前目錄中寫入。您需要寫入臨時文件（請參閱 StackExchange 上與 相關的答案mktemp）或其他可寫文件。

引用自：https://unix.stackexchange.com/questions/693234