Top Forums UNIX for Dummies Questions & Answers Command to find 32/64 bit in Linux Post 81246 by Perderabo on Wednesday 17th of August 2005 03:02:18 PM
Quote:
Originally Posted by 98_1LE
In Solaris 'isainfo -v' will tell you, but since Linux mostly runs on Intel hardware, there is a 99% chance it is 32.
Well, you're right, but a command would still be nice. 64 bit will become more common as time goes on. We have a 64/32 bit article in our faq section which addresses the question for several platforms. I looked for a linux command but didn't find one.
 
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FFS(3)							     Linux Programmer's Manual							    FFS(3)

NAME
ffs, ffsl, ffsll - find first bit set in a word SYNOPSIS
#include <strings.h> int ffs(int i); #define _GNU_SOURCE #include <string.h> int ffsl(long int i); int ffsll(long long int i); DESCRIPTION
The ffs() function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll() and ffsl() do the same but take arguments of possibly different size. RETURN VALUE
These functions return the position of the first bit set, or 0 if no bits are set in i. CONFORMING TO
ffs():4.3BSD,POSIX.1-2001. The ffsl() and ffsll() are glibc extensions. NOTES
BSD systems have a prototype in <string.h>. SEE ALSO
memchr(3), feature_test_macros(7) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2009-08-27 FFS(3)

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