chop the last character of a string in bash script

Use sed:
sed 's/.$//'

Where to find multi-core processor core mapping information

My OS is Fedora 13.

/sys/devices/system/cpu/cpu0/topology/core_siblings_list shows which CPUID are siblings;
/sys/devices/system/cpu/cpu0/topology/thread_siblings_list shows which CPUID are multithreading/hyperthreading siblings (i.e. virtual processors that share the same physical core).

/sys/devices/system/cpu/cpu0/cache/index/* contains all the cache information. Take my Intel Nehalem Xeon E5520 as an example:
/sys/devices/system/cpu/cpu0/cache/index0/level shows this is a L1 cache;
/sys/devices/system/cpu/cpu0/cache/index0/type shows this is a data cache;
/sys/devices/system/cpu/cpu0/cache/index0/size shows the cache size is 32KB.

Similarly,
/sys/devices/system/cpu/cpu0/cache/index1/ describes the L1 Icache;
/sys/devices/system/cpu/cpu0/cache/index2/ depicts the L2 unified cache;
/sys/devices/system/cpu/cpu0/cache/index3/ is for the L3 unified shared cache.