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shell-to determine the current online host in the network

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Tag: Indicates the return value of the CTR online packet host Images network SRC

Determine which hosts are online in the current network (the ping return value is true, indicating that the host is online)

The trap instruction is used to perform the action that will be taken after the command signal is received, and the common use is to complete the cleanup when the script is interrupted. The main use here is to interrupt the program after pressing CTRL + C.

-W Specifies the time-out in seconds.

The ping command is required to send packets continuously until a count of requests is issued and accepted.

shell-to determine the current online host in the network

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