如何查看linux的版本
方法一：
[root@test bin]# uname -a
Linux test.priv 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux方法二：
[root@test bin]# cat /proc/version
Linux version 2.6.32-431.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Fri Nov 22 03:15:09 UTC 2013说明：
／proc文件系统，它不是普通的文件系统，而是系统内核的映像，也就是说，该目录中的文件是存放在系统内存之中的，它以文件系统的方式为访问系统内核数据的操作提供接口。而我们使用命令“uname -a“的信息也是从该文件获取的，当然用方法二的命令直接查看它的内容也可以达到同等效果。另外，加上参数”a“是获得详细信息，如果不加参数为查看系统名称。
方法三：
[root@test bin]# cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m方法四：
[root@test bin]# cat /etc/redhat-release
CentOS release 6.5 (Final)如何查看mysql的版本
方法一：使用命令行模式进入mysql会看到最开始的提示符
[root@test ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1378261
Server version: 5.6.27-log MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.方法二：
mysql> status
--------------
mysql Ver 14.14 Distrib 5.6.27, for linux-glibc2.5 (x86_64) using EditLine wrapper
Connection id: 1378261
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.6.27-log MySQL Community Server (GPL)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /tmp/mysql.sock
Uptime: 75 days 35 min 28 sec
Threads: 43 Questions: 294878351 Slow queries: 285707 Opens: 93586 Flush tables: 1 Open tables: 1024 Queries per second avg: 45.490
--------------如何查看redis的版本
方法一：
[root@test bin]# /usr/local/redis/bin/redis-server -v
Redis server v=3.0.2 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64 build=4a9f67dba821eea5或者：
[root@test bin]# /usr/local/redis/bin/redis-server --version
Redis server v=3.0.2 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64 build=4a9f67dba821eea5方法二：
首先通过redis-cli连接到redis：
[root@test bin]# /usr/local/redis/bin/redis-cli然后输入info命令，可以看到redis的版本信息：
127.0.0.1:6379> info
# Server
redis_version:3.0.2
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:4a9f67dba821eea5
redis_mode:standalone
os:Linux 2.6.32-431.el6.x86_64 x86_64info命令输出的内容比较多，此处只展示了与redis版本相关的信息。
如何查看Tomcat的版本
首先进入tomcat的bin目录，ls一下，可以看到该目录里有一个 version.sh 脚本：
[root@test bin]# ls
bootstrap.jar configtest.sh setenv.sh tool-wrapper.bat
catalina.bat daemon.sh shutdown.bat tool-wrapper.sh
catalina.sh digest.bat shutdown.sh version.bat
catalina-tasks.xml digest.sh startup.bat version.sh
commons-daemon.jar hs_err_pid16987.log startup.sh
commons-daemon-native.tar.gz setclasspath.bat tomcat-juli.jar
configtest.bat setclasspath.sh tomcat-native.tar.gz运行该脚本可以查看tomcat的版本号：
[root@test bin]# ./version.sh
Using CATALINA_BASE: /usr/local/apache-tomcat-8.0.36
Using CATALINA_HOME: /usr/local/apache-tomcat-8.0.36
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-8.0.36/temp
Using JRE_HOME: /usr/local/java/jre
Using CLASSPATH: /usr/local/apache-tomcat-8.0.36/bin/bootstrap.jar:/usr/local/apache-tomcat-8.0.36/bin/tomcat-juli.jar
Server version: Apache Tomcat/8.0.36
Server built: Jun 9 2016 13:55:50 UTC
Server number: 8.0.36.0
OS Name: Linux
OS Version: 2.6.32-431.el6.x86_64
Architecture: amd64
JVM Version: 1.8.0_66-b17
JVM Vendor: Oracle Corporation如何查看activeMQ的版本
[root@test bin]# ./activemq --version
INFO: Loading '/opt/apache-activemq-5.13.2//bin/env'
INFO: Using java '/usr/local/java/bin/java'
Java Runtime: Oracle Corporation 1.8.0_66 /opt/jdk1.8.0_66/jre
Heap sizes: current=62976k free=61664k max=932352k
JVM args: -Xms64M -Xmx1G -Djava.util.logging.config.file=logging.properties -Djava.security.auth.login.config=/opt/apache-activemq-5.13.2/conf/login.config -Dactivemq.classpath=/opt/apache-activemq-5.13.2//conf:/opt/apache-activemq-5.13.2//../lib/: -Dactivemq.home=/opt/apache-activemq-5.13.2/ -Dactivemq.base=/opt/apache-activemq-5.13.2/ -Dactivemq.conf=/opt/apache-activemq-5.13.2//conf -Dactivemq.data=/opt/apache-activemq-5.13.2/data
Extensions classpath:
[/opt/apache-activemq-5.13.2/lib,/opt/apache-activemq-5.13.2/lib/camel,/opt/apache-activemq-5.13.2/lib/optional,/opt/apache-activemq-5.13.2/lib/web,/opt/apache-activemq-5.13.2/lib/extra]
ACTIVEMQ_HOME: /opt/apache-activemq-5.13.2
ACTIVEMQ_BASE: /opt/apache-activemq-5.13.2
ACTIVEMQ_CONF: /opt/apache-activemq-5.13.2/conf
ACTIVEMQ_DATA: /opt/apache-activemq-5.13.2/data
ActiveMQ 5.13.2
For help or more information please see: http://activemq.apache.org倒数第二行，可以看到ActiveMQ的版本号为5.13.2 。
如何查看nginx的版本
[darkmi@darkmi-desk ~]$sudo nginx -V
Password:
nginx version: nginx/1.6.2
built by clang 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/Cellar/nginx/1.6.2 --with-http_ssl_module --with-pcre --with-ipv6 --sbin-path=/usr/local/Cellar/nginx/1.6.2/bin/nginx --with-cc-opt='-I/usr/local/Cellar/pcre/8.36/include -I/usr/local/Cellar/openssl/1.0.1j_1/include' --with-ld-opt='-L/usr/local/Cellar/pcre/8.36/lib -L/usr/local/Cellar/openssl/1.0.1j_1/lib' --conf-path=/usr/local/etc/nginx/nginx.conf --pid-path=/usr/local/var/run/nginx.pid --lock-path=/usr/local/var/run/nginx.lock --http-client-body-temp-path=/usr/local/var/run/nginx/client_body_temp --http-proxy-temp-path=/usr/local/var/run/nginx/proxy_temp --http-fastcgi-temp-path=/usr/local/var/run/nginx/fastcgi_temp --http-uwsgi-temp-path=/usr/local/var/run/nginx/uwsgi_temp --http-scgi-temp-path=/usr/local/var/run/nginx/scgi_temp --http-log-path=/usr/local/var/log/nginx/access.log --error-log-path=/usr/local/var/log/nginx/error.log --with-http_gzip_static_module