netcat是网络工具中的瑞士军刀，它能通过TCP和UDP在网络中读写数据。通过与其他工具结合和重定向，你可以在脚本中以多种方式使用它。使用netcat命令所能完成的事情令人惊讶。
netcat所做的就是在两台电脑之间建立链接并返回两个数据流，在这之后所能做的事就看你的想像力了。你能建立一个服务器，传输文件，与朋友聊天，传输流媒体或者用它作为其它协议的独立客户端。
下面是一些使用netcat的例子.
[A(172.31.100.7) B(172.31.100.23)]
安装方式一：yum安装
yum install -y netcat
[root@iZbp143t3oxhfc3ar7jey0Z ~]# yum install -y netcat Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * webtatic: uk.repo.webtatic.com No package netcat available. Error: Nothing to do
安装方式二：编译安装
[root@iZbp143t3oxhfc3ar7jey0Z ~]# ll total 801808 -rw-r--r-- 1 root root 245 Mar 12 15:09 aaa.text -rw------- 1 root root 500336640 Feb 21 22:15 elasticsearch.tar drwxr-xr-x 4 root root 4096 Mar 3 13:57 littleTools drwxr-xr-x 2 root root 4096 Feb 17 21:39 mysql-5.6.35-linux-glibc2.5-x86_64 -rw-r--r-- 1 root root 314581668 Feb 17 21:38 mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz -rw-r--r-- 1 root root 398872 Mar 16 00:29 netcat-0.7.1.tar.gz -rw-r--r-- 1 root root 399029 Mar 16 00:28 netcat-0.7-persist.rar drwxrwxr-x 5 test1 test1 4096 Feb 21 19:41 ngx_openresty-1.9.7.1 -rw-r--r-- 1 root root 3548444 Dec 25 2015 ngx_openresty-1.9.7.1.tar.gz -rw-r--r-- 1 root root 1062 Mar 6 00:07 passwd drwxrwxr-x 6 root root 4096 Mar 13 12:50 redis-4.0.12 -rw-r--r-- 1 root root 1740544 Dec 12 2018 redis-4.0.12.tar.gz [root@iZbp143t3oxhfc3ar7jey0Z ~]# rm -rf netcat-0.7-persist.rar [root@iZbp143t3oxhfc3ar7jey0Z ~]# tar -zxvf netcat-0.7.1.tar.gz -C /usr/local/ netcat-0.7.1/ netcat-0.7.1/m4/ netcat-0.7.1/m4/lib-link.m4 netcat-0.7.1/m4/inttypes_h.m4 netcat-0.7.1/m4/lcmessage.m4 netcat-0.7.1/m4/inttypes.m4 netcat-0.7.1/m4/lib-ld.m4 netcat-0.7.1/m4/inttypes-pri.m4
进入解压之后的目录
[root@iZbp143t3oxhfc3ar7jey0Z ~]# cd /usr/local/netcat-0.7.1/ [root@iZbp143t3oxhfc3ar7jey0Z netcat-0.7.1]# ll total 688 -rw-r--r-- 1 100 users 24687 Aug 17 2002 ABOUT-NLS -rw-r--r-- 1 100 users 109116 Jan 12 2004 aclocal.m4 -rw-r--r-- 1 100 users 473 Nov 5 2003 AUTHORS -rw-r--r-- 1 100 users 12282 Jan 12 2004 ChangeLog -rwxr-xr-x 1 100 users 42037 Jan 12 2004 config.guess -rw-r--r-- 1 100 users 7737 Jan 12 2004 config.h.in -rwxr-xr-x 1 100 users 14108 May 1 2002 config.rpath -rwxr-xr-x 1 100 users 30305 Jan 12 2004 config.sub -rwxr-xr-x 1 100 users 316783 Jan 12 2004 configure -rw-r--r-- 1 100 users 5814 Jan 4 2004 configure.ac -rw-rw-r-- 1 100 users 17992 May 4 2002 COPYING drwxrwxrwx 3 100 users 4096 Jan 12 2004 doc -rw-r--r-- 1 100 users 9240 Oct 3 2002 INSTALL -rwxr-xr-x 1 100 users 7122 Jan 12 2004 install-sh drwxrwxrwx 3 100 users 4096 Jan 12 2004 lib drwxrwxrwx 2 100 users 4096 Jan 12 2004 m4 -rw-r--r-- 1 100 users 917 Jan 4 2003 Makefile.am -rw-r--r-- 1 100 users 17855 Jan 12 2004 Makefile.in -rwxr-xr-x 1 100 users 10270 Jan 12 2004 missing -rwxr-xr-x 1 100 users 1988 Jan 12 2004 mkinstalldirs -rw-r--r-- 1 100 users 6143 Jan 12 2004 NEWS drwxrwxrwx 2 100 users 4096 Jan 12 2004 po -rw-r--r-- 1 100 users 1041 Dec 31 2003 README drwxrwxrwx 2 100 users 4096 Jan 12 2004 src -rw-r--r-- 1 100 users 2197 Aug 29 2003 TODO [root@iZbp143t3oxhfc3ar7jey0Z netcat-0.7.1]# ./configure -prefix=/usr/local/netcat checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking target system type... x86_64-unknown-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... [root@iZbp143t3oxhfc3ar7jey0Z netcat-0.7.1]# make && make install make all-recursive make[1]: Entering directory `/usr/local/netcat-0.7.1' Making all in m4 make[2]: Entering directory `/usr/local/netcat-0.7.1/m4' make[2]: Nothing to be done for `all'. make[2]: Leaving directory `/usr/local/netcat-0.7.1/m4' Making all in lib make[2]: Entering directory `/usr/local/netcat-0.7.1/lib' Making all in contrib make[3]: Entering directory `/usr/local/netcat-0.7.1/lib/contrib' [root@iZbp143t3oxhfc3ar7jey0Z netcat-0.7.1]# cd /usr/local/netcat [root@iZbp143t3oxhfc3ar7jey0Z netcat]# ll total 16 drwxr-xr-x 2 root root 4096 Mar 16 00:30 bin drwxr-xr-x 2 root root 4096 Mar 16 00:30 info drwxr-xr-x 3 root root 4096 Mar 16 00:30 man drwxr-xr-x 3 root root 4096 Mar 16 00:30 share
注：此处的/usr/local/netcat−0.7.1/相当于源码文件，安装成功的文件是/usr/local/netcat，这里可以将/usr/local/netcat−0.7.1/删除注：此处的/usr/local/netcat−0.7.1/相当于源码文件，安装成功的文件是/usr/local/netcat，这里可以将/usr/local/netcat−0.7.1/删除
配置环境变量
export NETCAT_HOME=/usr/local/netcat export PATH=$PATH:$NETCAT_HOME/bin
重新载入配置文件：
[root@iZbp143t3oxhfc3ar7jey0Z netcat]# vi /etc/profile [root@iZbp143t3oxhfc3ar7jey0Z netcat]# source /etc/profile
测试是否安装成功
[root@iZbp143t3oxhfc3ar7jey0Z netcat]# netcat --help GNU netcat 0.7.1, a rewrite of the famous networking tool. Basic usages: connect to somewhere: netcat [options] hostname port [port] ... listen for inbound: netcat -l -p port [options] [hostname] [port] ... tunnel to somewhere: netcat -L hostname:port -p port [options] Mandatory arguments to long options are mandatory for short options too. Options: -c, --close close connection on EOF from stdin -e, --exec=PROGRAM program to exec after connect -g, --gateway=LIST source-routing hop point[s], up to 8 -G, --pointer=NUM source-routing pointer: 4, 8, 12, ... -h, --help display this help and exit -i, --interval=SECS delay interval for lines sent, ports scanned -l, --listen listen mode, for inbound connects -L, --tunnel=ADDRESS:PORT forward local port to remote address -n, --dont-resolve numeric-only IP addresses, no DNS -o, --output=FILE output hexdump traffic to FILE (implies -x) -p, --local-port=NUM local port number -r, --randomize randomize local and remote ports -s, --source=ADDRESS local source address (ip or hostname) -t, --tcp TCP mode (default) -T, --telnet answer using TELNET negotiation -u, --udp UDP mode -v, --verbose verbose (use twice to be more verbose) -V, --version output version information and exit -x, --hexdump hexdump incoming and outgoing traffic -w, --wait=SECS timeout for connects and final net reads -z, --zero zero-I/O mode (used for scanning) Remote port number can also be specified as range. Example: '1-1024'
需要压缩包的留言即可。