file /sbin/init 或者 file /bin/ls

/sbin/init: ELF64-bitLSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped
如果显示 64-bit 则为64位;

file /sbin/init
/sbin/init: ELF32-bitLSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped
如果显示为32 bit 则为32bit;

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