Centos下安装nc

netcat(nc,”脑残”)是一个简单而有用的工具，被誉为网络安全界的“瑞士均道”，不仅可以通过使用TCP或UDP协议的网络连接读写数据，同时还是一个功能强大的网络调试和探测工具，能够建立你需要的几乎所有类型的网络连接。

在Linux终端窗口可以直接使用yum工具进行安装：

[root@Master ~]# yum install nc.x86_64

等待安装完成

Loaded plugins: fastestmirror, refresh-packagekit, securitySetting up Install ProcessDetermining fastest mirrorsbase                                                    | 3.7 kB     00:00     Resolving Dependencies--> Running transaction check---> Package nc.x86_64 0:1.84-24.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved=============================================================================== Package       Arch              Version                 Repository       Size===============================================================================Installing: nc            x86_64            1.84-24.el6             base             57 kTransaction Summary===============================================================================Install       1 Package(s)Total download size: 57 kInstalled size: 109 kIs this ok [y/N]: yDownloading Packages:nc-1.84-24.el6.x86_64.rpm                               |  57 kB     00:00     Running rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning Transaction  Installing : nc-1.84-24.el6.x86_64                                       1/1   Verifying  : nc-1.84-24.el6.x86_64                                       1/1 Installed:  nc.x86_64 0:1.84-24.el6                                                      Complete!

这样就装好了

测试一下,运行nc -help查看命令是否正常安装

usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]          [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]          [-x proxy_address[:port]] [hostname] [port[s]]        Command Summary:                -4              Use IPv4                -6              Use IPv6                -D              Enable the debug socket option                -d              Detach from stdin                -h              This help text                -i secs         Delay interval for lines sent, ports scanned                -k              Keep inbound sockets open for multiple connects                -l              Listen mode, for inbound connects                -n              Suppress name/port resolutions                -p port         Specify local port for remote connects                -r              Randomize remote ports                -S              Enable the TCP MD5 signature option                -s addr         Local source address                -T ToS          Set IP Type of Service                -C              Send CRLF as line-ending                -t              Answer TELNET negotiation                -U              Use UNIX domain socket                -u              UDP mode                -v              Verbose                -w secs         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              Zero-I/O mode [used for scanning]        Port numbers can be individual or ranges: lo-hi [inclusive]