❑ ulimit : This limits system resources. The settings apply to login shells and subshells.
❑ Usage
❍ $ulimit -f 0
❍ $ulimit -f unlimited
❍ $ulimit -n 2048
 
  | Check environment | 
  | O      S | Ubuntu 15.10 (64bit) | CPU | Intel i7-4710MQ 2.50GHz | 
  | SHELL | GNU bash (4.3.42) | GPU | Gallium 0.4 on SVGA3D | 
  |  |  | RAM | 984MiB |