怎样查看 linux操作系统是多少位的

#file /bin/ls

如果显示像这样：

/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.0, dynamically linked (uses shared libs), stripped

说明是：32 bit；

如果显示像这样：

/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.0, dynamically linked (uses shared libs), stripped

这是64 bit.