Linux system uses telnet to send customized messages
The connection to the remote host using telnet on Linux is successful, but sending a custom message shows Invalid command (as shown in the picture). Is the sending successful or failed? 
The connection to the remote host using telnet on Linux is successful, but sending a custom message shows Invalid command (as shown in the picture). Is the sending successful or failed?
PHP中文网2017-05-27 17:46:50
Invalid commandIt means your command is not recognized by your telnet client. Use help to print out the commands it supports
