How to determine whether a given Linux is 32 bit or 64 bit?

http://stackoverflow.com/questions/246007/how-to-determine-whether-a-given-linux-is-32-bit-or-64-bit 

 

 

 

Try uname -m. It seems like the uname -m actually gives

• x86_64 when it is an kernel 64 bits
• i686 for 32 bits kernel

---

Otherwise, not for the Linux kernel, but for the CPU, you type:

cat /proc/cpuinfo

or:

grep flags /proc/cpuinfo

Under "flags" parameter, you will see various values. Among them, one is named "tm(transparent mode)" or "rm(real mode)" or "lm(long mode)"

1. rm means: 16 bit processor
2. tm means: 32 bit processor
3. lm means: 64 bit processor

Note: you can have a 64-bit CPU with a 32-bit kernel installed"