ping 多台主機並執行命令

我是 bash 腳本和 unix 方面的新手，所以我需要一些幫助。我有 7-10 台主機，我想通過 cronjobs 從其中一台伺服器 ping。我想要的是主機何時可以對其執行命令。下來的時候什麼都不做。

我不想要日誌或任何消息。到目前為止，我有這個，不幸的是現在沒有能力嘗試它。如果您可以檢查並指出我。

#!/bin/bash
servers=( "1.1.1.1" "2.2.2.2" "3.3.3.3" "4.4.4.4" "5.5.5.5" "6.6.6.6" "7.7.7.7" )

for i in "${servers[@]}"
do
 ping -c 1 $i > /dev/null  
done

ping -c 1 $i > /dev/null
if [ $? -ne 0 ]; then

   if [ $STATUS >= 2 ]; then
       echo ""
   fi
else
   while [ $STATUS <= 1 ];
   do 
      # command should be here where is status 1 ( i.e. Alive )
      /usr/bin/snmptrap -v 2c -c public ...
   done
fi

我不確定這是否正確。我在一個教程中使用過這個，有些事情我不確定它們到底做了什麼。

我在這裡是正確的方式還是我完全錯了？

我已經做了一些評論來解釋腳本的不同部分在做什麼。然後，我製作了以下腳本的簡明版本。

#!/bin/bash
servers=( "1.1.1.1" "2.2.2.2" "3.3.3.3" "4.4.4.4" "5.5.5.5" "6.6.6.6" "7.7.7.7" )

# As is, this bit doesn't do anything.  It just pings each server one time 
# but doesn't save the output

for i in "${servers[@]}"
do
 ping -c 1 $i > /dev/null  
# done
# "done" marks the end of the for-loop.  You don't want it to end yet so I
# comment it out

# You've already done this above so I'm commenting it out
#ping -c 1 $i > /dev/null

   # $? is the exit status of the previous job (in this case, ping).  0 means
   # the ping was successful, 1 means not successful.
   # so this statement reads "If the exit status ($?) does not equal (-ne) zero
   if [ $? -ne 0 ]; then
       # I can't make sense of why this is here or what $STATUS is from
       # You say when the host is down you want it to do nothing so let's do
       # nothing
       #if [ $STATUS >= 2 ]; then
       #    echo ""
       #fi
       true
   else
       # I still don't know what $STATUS is
       #while [ $STATUS <= 1 ];
       #do 
          # command should be here where is status 1 ( i.e. Alive )
          /usr/bin/snmptrap -v 2c -c public ...
       #done
   fi

# Now we end the for-loop from the top
done

如果每個伺服器都需要一個參數，請在 for 循環中創建一個參數數組和一個索引變數。通過索引訪問參數：

#!/bin/bash
servers=( "1.1.1.1" "2.2.2.2" "3.3.3.3" "4.4.4.4" "5.5.5.5" "6.6.6.6" "7.7.7.7" )
params=(PARAM1 PARAM2 PARAM3 PARAM4 PARAM5 PARAM6 PARAM7)

n=0
for i in "${servers[@]}"; do
   ping -c 1 $i > /dev/null  

   if [ $? -eq 0 ]; then
      /usr/bin/snmptrap -v 2c -c public ${params[$n]} ...
   fi

   let $((n+=1)) # increment n by one

done

引用自：https://unix.stackexchange.com/questions/147203