1.查看系统的位数:
[[email protected] jdk8]# file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=c5ad78cfc1de12b9bb6829207cececb990b3e987, stripped
jdk8]# f
阅读背景：
Linux(CentOs 7) 安装 java 应用
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