Linux随便写写

netcat
Command Summary:

command	解释
-4	Use IPv4
-6	Use IPv6
-b	Allow broadcast
-C	Send CRLF as line-ending
-D	Enable the debug socket option
-d	Detach from stdin
-F	Pass socket fd
-h	This help text
-I length	TCP receive buffer length
-i interval	Delay interval for lines sent, ports scanned
-k	Keep inbound sockets open for multiple connects
-l	Listen mode, for inbound connects
-M ttl	Outgoing TTL / Hop Limit
-m minttl	Minimum incoming TTL / Hop Limit
-N	Shutdown the network socket after EOF on stdin
-n	Suppress name/port resolutions
-O length	TCP send buffer length
-P proxyuser	Username for proxy authentication
-p port	Specify local port for remote connects
-q secs	quit after EOF on stdin and delay of secs
-r	Randomize remote ports
-S	Enable the TCP MD5 signature option
-s source	Local source address
-T	keyword TOS value
-t	Answer TELNET negotiation
-U	Use UNIX domain socket
-u	UDP mode
-V rtable	Specify alternate routing table
-v	Verbose
-W recvlimit	Terminate after receiving a number of packets
-w timeout	Timeout for connects and final net reads
-X proto	Proxy protocol: “4”, “5” (SOCKS) or “connect”
-x addr[:port]	Specify proxy address and port
-Z	DCCP mode
-z	Zero-I/O mode [used for scanning]

常用 nc -vzw 1 61.135.169.125 80
查看开放端口