grep -q ' lm ' /proc/cpuinfo; [ 0 -eq 0 ] && echo '64bit supported'
it shows whether your CPU supports 64 bit (x86-64) mode. uname -a only shows whether you have 64 bit (x86-64) or 32bit (i386) OS installed, this one-liner answers question: Can I install 64bit OS on this machine?
Thursday, January 24, 2013
[one-liner] shows whether your CPU supports 64bit mode
