shell腳本之ping ip

  #!/bin/bash                                                                
  #2018 02 12  #!/bin/bash                                                                
  
  #2018 02 12
  #lee:[email protected]
  #ping ip
  #設置位置變量，輸入ip
  [ $# -ne 1 ] && echo 'need a $1' && exit 1
  ip=$1
  #ping 兩次(-c 2)，兩秒鐘(-w 2)
  ping -c 2 -w 2 $ip >/dev/null 2>&1

 #成功返回ip is on ，ip不存在或者不成功返回ip is not exit
 [ $? -eq 0 ] && echo "ping $ip is on" || echo "ping $ip is not exit or successful"

測試結果: