how to find unix is 64bit or 32bit

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u can try in below three methods.

>$ file /sbin/init

/sbin/init: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.16, dynamically linked (uses shared libs), stripped

>$ file /usr/bin/file
/usr/bin/file: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), stripped

>$ uname -m
x86_64

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