====== مدیریت process ها ======

  
  * ps / -A / fax / auxww
  * top / htop / atop 2
  * pgrep -x
  * pstree -p (parent/child/fork)
  * background/forground:  & ctrl-z jobs bg fg
  * kill -KILL / killall / man signal / SIGTERM , SIGKILL , SIGHUP, SIGINT
  * lsof -n / list open files
  * /proc , cmdline , cwd , exe , loginuid , fd , environ
         cat /proc/uptime
         cat /proc/version
         cat /proc/swaps
         cat /proc/partitions
         cat /proc/cpuinfo
  * ps -p 1 -o comm=