查看Linux系统发行版名称
检查命令：
cat /proc/version
# cat /proc/version
Linux version 3.10.0-327.el7.x86_64 (mockbuild@x86-034.build.eng.bos.redhat.com) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Oct 29 17:29:29 EDT 2015
2. uname -mrs
3. lsb_release
4. cat /etc/redhat-release
5. cat /etc/issue