/proc File system usages

NOTE: The following are found in 32-bit Ubuntu system (Kernel version:  3.2.0-29-generic-pae)

1. [PID_MAX]:  default - 32768 (short int)
"/proc/sys/kernel/pid_max"

2. [Loadable Modules]
"/proc/modules" Used by "lsmod"

3. [printk levels]: default 7
echo "/proc/sys/kernel/printk"