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process-management.md

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Process Management

Use this table to understand the data displayed on running below commands

Column Header What does it means
PID Process ID
TTY Controlling terminal associated with the process
TIME CPU usages
CMD Name of the command
PPID Parent process ID
SID Session ID
PGID Parent group process ID
TPGID Terminal sessions ID with which the process is associated
UID User ID associated with the process

ps - Show process status

  • Display processes that have controlling terminals
  $ps
  • Display other user's process info including those without controlling terminals
  $ps -ef
  • Display the most amount of information
  $ps aux
  • Display processes ran by a particular user
  $ps -u <user_name>
  • Display processes ran by a particular group
  $ps -g <group_name>
  • Display processes and it's sub-processes
  $ps -ejH
  • Filter and display a particular type of process
  $ps -ef | grep http

kill - Terminate or signal a process

  • It is used to send signal to the processes using pid (Process ID).

  • In order to send signal to other user's process you have to be super-user.

  • The utility exits 0 on success, and >0 if an error occurs.

  • Some of the more commonly used signals:

      1       HUP (hang up)
  2       INT (interrupt)
  3       QUIT (quit)
  6       ABRT (abort)
  9       KILL (non-catchable, non-ignorable kill)
  14      ALRM (alarm clock)
  15      TERM (software termination signal)

  • Display all the available signals

  $kill -l
  • Terminate the processes with PIDs 142 and 157
  $kill 142 157
  • Send the hangup signal (SIGHUP) to the process with PID 507
  $kill -s HUP 507
  • Terminate the process group with PGID 117
  $kill -- -117

Note : Check man of ps and kill to know more available options.